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-15x+4(x-3)+8x=9x-84
We simplify the equation to the form, which is simple to understand
-15x+4(x-3)+8x=9x-84
Reorder the terms in parentheses
-15x+(+4x-12)+8x=9x-84
Remove unnecessary parentheses
-15x+4x-12+8x=+9x-84
We move all terms containing x to the left and all other terms to the right.
-15x+4x+8x-9x=-84+12
We simplify left and right side of the equation.
-12x=-72
We divide both sides of the equation by -12 to get x.
x=6
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