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x-7+3x=21
We simplify the equation to the form, which is simple to understand
x-7+3x=21
We move all terms containing x to the left and all other terms to the right.
+1x+3x=+21+7
We simplify left and right side of the equation.
+4x=+28
We divide both sides of the equation by 4 to get x.
x=7
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