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7x+11+2x+8=55
We simplify the equation to the form, which is simple to understand
7x+11+2x+8=55
We move all terms containing x to the left and all other terms to the right.
+7x+2x=+55-11-8
We simplify left and right side of the equation.
+9x=+36
We divide both sides of the equation by 9 to get x.
x=4
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