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8x-42=x-21
We simplify the equation to the form, which is simple to understand
8x-42=x-21
We move all terms containing x to the left and all other terms to the right.
+8x-1x=-21+42
We simplify left and right side of the equation.
+7x=+21
We divide both sides of the equation by 7 to get x.
x=3
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