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x-5+3x-21+12-3x=4
We simplify the equation to the form, which is simple to understand
x-5+3x-21+12-3x=4
We move all terms containing x to the left and all other terms to the right.
+1x+3x-3x=+4+5+21-12
We simplify left and right side of the equation.
+1x=+18
We divide both sides of the equation by 1 to get x.
x=18
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