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7(3+12x)-10x=-10x+21
We simplify the equation to the form, which is simple to understand
7(3+12x)-10x=-10x+21
Reorder the terms in parentheses
+(+21+84x)-10x=-10x+21
Remove unnecessary parentheses
+21+84x-10x=-10x+21
We move all terms containing x to the left and all other terms to the right.
+84x-10x+10x=+21-21
We simplify left and right side of the equation.
+84x=0
We divide both sides of the equation by 84 to get x.
x=0
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