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7x+3(1-x)=15
We simplify the equation to the form, which is simple to understand
7x+3(1-x)=15
Reorder the terms in parentheses
7x+(+3-3x)=15
Remove unnecessary parentheses
+7x+3-3x=+15
We move all terms containing x to the left and all other terms to the right.
+7x-3x=+15-3
We simplify left and right side of the equation.
+4x=+12
We divide both sides of the equation by 4 to get x.
x=3
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