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-100=-2x+3(-3x-15)
We simplify the equation to the form, which is simple to understand
-100=-2x+3(-3x-15)
Reorder the terms in parentheses
-100=-2x+(-9x-45)
Remove unnecessary parentheses
-100=-2x-9x-45
We move all terms containing x to the left and all other terms to the right.
+2x+9x=-45+100
We simplify left and right side of the equation.
+11x=+55
We divide both sides of the equation by 11 to get x.
x=5
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