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3x-2+5x=7x+2x+21
We simplify the equation to the form, which is simple to understand
3x-2+5x=7x+2x+21
We move all terms containing x to the left and all other terms to the right.
+3x+5x-7x-2x=+21+2
We simplify left and right side of the equation.
-1x=+23
We divide both sides of the equation by -1 to get x.
x=-23
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