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