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3x+4x+4=81
We simplify the equation to the form, which is simple to understand
3x+4x+4=81
We move all terms containing x to the left and all other terms to the right.
+3x+4x=+81-4
We simplify left and right side of the equation.
+7x=+77
We divide both sides of the equation by 7 to get x.
x=11
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