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7x+8+6x=21
We simplify the equation to the form, which is simple to understand
7x+8+6x=21
We move all terms containing x to the left and all other terms to the right.
+7x+6x=+21-8
We simplify left and right side of the equation.
+13x=+13
We divide both sides of the equation by 13 to get x.
x=1
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