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12x-2(x+5)=3x(5+2)+45
We simplify the equation to the form, which is simple to understand
12x-2(x+5)=3x(5+2)+45
Simplifying terms in parentheses
12x-2*(x+5)=3x*(+7)+45
Reorder the terms in parentheses
12x+(-2x-10)=3x*(+7)+45
Remove unnecessary parentheses
+12x-2x-10=+3x+*(+7+)+45
Reorder the terms in parentheses
12x-2x-10=+(+21x)+45
Remove unnecessary parentheses
+12x-2x-10=+21x+45
We move all terms containing x to the left and all other terms to the right.
+12x-2x-21x=+45+10
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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