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(x+3)+3(x-3)=-9
We simplify the equation to the form, which is simple to understand
(x+3)+3(x-3)=-9
Remove unnecessary parentheses
x+3+3*(x-3)=-9
Reorder the terms in parentheses
x+3+(+3x-9)=-9
Remove unnecessary parentheses
+x+3+3x-9=-9
We move all terms containing x to the left and all other terms to the right.
+1x+3x=-9-3+9
We simplify left and right side of the equation.
+4x=-3
We divide both sides of the equation by 4 to get x.
x=-0.75
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