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-21-6x=-8(x+7)-3x
We simplify the equation to the form, which is simple to understand
-21-6x=-8(x+7)-3x
Reorder the terms in parentheses
-21-6x=+(-8x-56)-3x
Remove unnecessary parentheses
-21-6x=-8x-56-3x
We move all terms containing x to the left and all other terms to the right.
-6x+8x+3x=-56+21
We simplify left and right side of the equation.
+5x=-35
We divide both sides of the equation by 5 to get x.
x=-7
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