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x+15=4*(x+9)
We simplify the equation to the form, which is simple to understand
x+15=4*(x+9)
Reorder the terms in parentheses
x+15=+(+4x+36)
Remove unnecessary parentheses
+x+15=+4x+36
We move all terms containing x to the left and all other terms to the right.
+1x-4x=+36-15
We simplify left and right side of the equation.
-3x=+21
We divide both sides of the equation by -3 to get x.
x=-7
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