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x+6x-42=49
We simplify the equation to the form, which is simple to understand
x+6x-42=49
We move all terms containing x to the left and all other terms to the right.
+1x+6x=+49+42
We simplify left and right side of the equation.
+7x=+91
We divide both sides of the equation by 7 to get x.
x=13
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