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4[x-7]=20
We simplify the equation to the form, which is simple to understand
4(x-7)=20
Reorder the terms in parentheses
+(+4x-28)=20
Remove unnecessary parentheses
+4x-28=+20
We move all terms containing x to the left and all other terms to the right.
+4x=+20+28
We simplify left and right side of the equation.
+4x=+48
We divide both sides of the equation by 4 to get x.
x=12
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