Hey there! :)
3[-x + (2x + 1)] = x - 1
Simplify the parenthesis!
3[-x + 2x + 1] =x - 1
Add like terms.
3[x + 1] = x - 1
Simplify!
3x + 3 = x - 1
Subtract 1x from both sides.
3x + 3 - 1x = x - 1 - 1x
Simplify.
2x + 3 = -1
Subtract 3 from both sides.
2x = -4
Divide both sides by 2.
2x ÷ 2 = -4 ÷ 2
Simplify.
x = -2
~Hope I helped! :)