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3(1+x)=21+x
We simplify the equation to the form, which is simple to understand
3(1+x)=21+x
Reorder the terms in parentheses
+(+3+3x)=21+x
Remove unnecessary parentheses
+3+3x=+21+x
We move all terms containing x to the left and all other terms to the right.
+3x-1x=+21-3
We simplify left and right side of the equation.
+2x=+18
We divide both sides of the equation by 2 to get x.
x=9
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