Answer:
• On the second step, while using the distributive property.
[tex]7x - 70 - 2x \: { \red{ + }} \: 10 = 10x - 10[/tex]
» the red plus is the mistake, it had to be -10 not positive 10
correction:
[tex]7x - 70 - 2x \: { \green{ - }} \: 10= 10x - 10[/tex]
further more:
[tex] - 5x = 50 \\ x = - 10[/tex]
