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x+21-56-34=15
We simplify the equation to the form, which is simple to understand
x+21-56-34=15
We move all terms containing x to the left and all other terms to the right.
+1x=+15-21+56+34
We simplify left and right side of the equation.
+1x=+84
We divide both sides of the equation by 1 to get x.
x=84
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