Question

When ms. shreve solved an equation in class, she checked her solution and found that it did not make the equation true! Examine her work below and find her mistake. Then find the correct solution.
5(2×-1)-3×=5×+9
10×-5-3×=5×+9
7×-5=5××9
12×=4
×=1/3

Answer 1

The first part of the second line, she left the -5 there. The correct work and solution should be this:
5(2x-1)-3x=5x+9
7x−5=5x+9
2x-5=9
2x=14
x=7