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4x+5(5x-15)=128
We simplify the equation to the form, which is simple to understand
4x+5(5x-15)=128
Reorder the terms in parentheses
4x+(+25x-75)=128
Remove unnecessary parentheses
+4x+25x-75=+128
We move all terms containing x to the left and all other terms to the right.
+4x+25x=+128+75
We simplify left and right side of the equation.
+29x=+203
We divide both sides of the equation by 29 to get x.
x=7
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