Answer:
x = -2
Explanation:
Subtract 7 from both sides from the original problem
3x + 7 - 7 = - x - 1 - 7
simplify the expression
3 x+ 7 -7 = -x - 1 -7
Subtract the numbers
3x = -x - 8
Add x to both sides
3x + x = -x - 8 + x
Simplify the expression
4x = -8
Divide both sides by the same factor
4x/4 -8/4
Simplify the expression
Cancel terms that are both numerator and denominator
Divide the numbers
Answer: x = -2