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8x-21=2x+39
We simplify the equation to the form, which is simple to understand
8x-21=2x+39
We move all terms containing x to the left and all other terms to the right.
+8x-2x=+39+21
We simplify left and right side of the equation.
+6x=+60
We divide both sides of the equation by 6 to get x.
x=10
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