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4[1-2x]-20=0
We simplify the equation to the form, which is simple to understand
4(1-2x)-20=0
Reorder the terms in parentheses
+(+4-8x)-20=0
Remove unnecessary parentheses
+4-8x-20=0
We move all terms containing x to the left and all other terms to the right.
-8x=0-4+20
We simplify left and right side of the equation.
-8x=+16
We divide both sides of the equation by -8 to get x.
x=-2
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