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7x+15+x=39
We simplify the equation to the form, which is simple to understand
7x+15+x=39
We move all terms containing x to the left and all other terms to the right.
+7x+1x=+39-15
We simplify left and right side of the equation.
+8x=+24
We divide both sides of the equation by 8 to get x.
x=3
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