Question 617266
12x + 7 - 3x = 56x + 9
combining x's on the left side:
9x + 7 = 56x + 9
subtracting 9x from both sides:
7 = 47x + 9
subtracting 9 from both sides:
-2 = 47x
dividing both sides by 47
-2/47 = x
(or, approximately -0.04255)