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165=5x-4(5x-15)
We simplify the equation to the form, which is simple to understand
165=5x-4(5x-15)
Reorder the terms in parentheses
165=5x+(-20x+60)
Remove unnecessary parentheses
+165=+5x-20x+60
We move all terms containing x to the left and all other terms to the right.
-5x+20x=+60-165
We simplify left and right side of the equation.
+15x=-105
We divide both sides of the equation by 15 to get x.
x=-7
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