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15-42=3(x-1)-3
We simplify the equation to the form, which is simple to understand
15-42=3(x-1)-3
Reorder the terms in parentheses
15-42=+(+3x-3)-3
Remove unnecessary parentheses
+15-42=+3x-3-3
We move all terms containing x to the left and all other terms to the right.
-3x=-3-3-15+42
We simplify left and right side of the equation.
-3x=+21
We divide both sides of the equation by -03 to get x.
x=-7
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