Answer:
She added 83, instead of subtracting it.
In the second step it shows she adds it. Which is incorrect.
The correct answer is 27
Mia should have subtracted 83 from both sides of the equation.
Step-by-step explanation:
Option A is the answer...
-7*-15*-5=-525
-7*-75=-525
-1*525=-525
x= 7
Theorem: The sum of the angles of a triangle is 180
Memorize that theorem
8x - 9 + 63 + 70 = 180
8x + 124 = 180
8x = 56
