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5(x+3)+2(3+8x)=-21
We simplify the equation to the form, which is simple to understand
5(x+3)+2(3+8x)=-21
Reorder the terms in parentheses
+(+5x+15)+2*(3+8x)=-21
Remove unnecessary parentheses
+5x+15+2+*(+3+8x+)=-21
Reorder the terms in parentheses
+5x+15+(+6+16x)=-21
Remove unnecessary parentheses
+5x+15+6+16x=-21
We move all terms containing x to the left and all other terms to the right.
+5x+16x=-21-15-6
We simplify left and right side of the equation.
+21x=-42
We divide both sides of the equation by 21 to get x.
x=-2
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