Answer: x = -6
1. Make “x” to the left side, and numbers to the right side without forgetting to change the sign:
-2x + 1 = -x + 7
-2x + x = 7 - 1
-x = 6
2. Multiply both sides by -1 (number of x), to get the answer:
-x = 6 |*(-1)
x = -6
Proof:
(-2) * (-6) + 1 = -(-6) + 7 =
12 + 1 = 6 + 7
13 = 13, so answer is right.