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3(10+x)=18
We simplify the equation to the form, which is simple to understand
3(10+x)=18
Reorder the terms in parentheses
+(+30+3x)=18
Remove unnecessary parentheses
+30+3x=+18
We move all terms containing x to the left and all other terms to the right.
+3x=+18-30
We simplify left and right side of the equation.
+3x=-12
We divide both sides of the equation by 3 to get x.
x=-4
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