For each equation, decide if it is always true or never true.

1. \(x - 13 = x + 1\)

2. \(x+\frac{1}{2} = x - \frac{1}{2}\)

3. \(2(x + 3) = 5x + 6 - 3x\)

4. \(x - 3 = 2x - 3 -x\)

5. \(3(x-5) = 2(x-5) + x\)

Mai says that the equation \(2x + 2 = x +1\) has no solution because the left hand side is double the right hand side. Do you agree with Mai? Explain your reasoning.

1. Write the other side of this equation so it's true for all values of \(x\):

   \(\frac12(6x-10) - x =\)

2. Write the other side of this equation so it's true for no values of \(x\):

   \(\frac12(6x-10) - x = \)

Here is an equation that is true for all values of \(x\):    \(5(x+2) = 5x+10\).

Elena saw this equation and says she can tell that \(20(x+2)+31=4(5x+10)+31\) is also true for any value of \(x\).

How can she tell? Explain your reasoning.

Elena and Lin are trying to solve \(\frac12x+3=\frac72x+5\). Describe the change they each make to each side of the equation.

Solve each equation and check your solution.

A triangle has one side that is 5 units long and an adjacent angle that measures \(25^\circ\). The two other angles in the triangle measure \(90^\circ\) and \(65^\circ\). Complete the two diagrams to create two different triangles with these measurements.