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4(4+x)=100
We simplify the equation to the form, which is simple to understand
4(4+x)=100
Reorder the terms in parentheses
+(+16+4x)=100
Remove unnecessary parentheses
+16+4x=+100
We move all terms containing x to the left and all other terms to the right.
+4x=+100-16
We simplify left and right side of the equation.
+4x=+84
We divide both sides of the equation by 4 to get x.
x=21
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