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x+4-3(x+4)=0
We simplify the equation to the form, which is simple to understand
x+4-3(x+4)=0
Reorder the terms in parentheses
x+4+(-3x-12)=0
Remove unnecessary parentheses
+x+4-3x-12=0
We move all terms containing x to the left and all other terms to the right.
+1x-3x=0-4+12
We simplify left and right side of the equation.
-2x=+8
We divide both sides of the equation by -2 to get x.
x=-4
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