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8 + 2x + 5x = 78
We simplify the equation to the form, which is simple to understand
8+2x+5x=78
We move all terms containing x to the left and all other terms to the right.
+2x+5x=+78-8
We simplify left and right side of the equation.
+7x=+70
We divide both sides of the equation by 7 to get x.
x=10
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