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3(3x+7)-(-4x+5)=2x+7x
We simplify the equation to the form, which is simple to understand
3(3x+7)-(-4x+5)=2x+7x
Reorder the terms in parentheses
+(+9x+21)-(-4x+5)=2x+7x
Remove unnecessary parentheses
+9x+21-(-4x+5+)=+2x+7x
Remove unnecessary parentheses
+9x+21+4x-5=2x+7x
We move all terms containing x to the left and all other terms to the right.
+9x+4x-2x-7x=-21+5
We simplify left and right side of the equation.
+4x=-16
We divide both sides of the equation by 4 to get x.
x=-4
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