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18x-x+5x-21x=13
We simplify the equation to the form, which is simple to understand
18x-x+5x-21x=13
We move all terms containing x to the left and all other terms to the right.
+18x-1x+5x-21x=+13
We simplify left and right side of the equation.
+1x=+13
We divide both sides of the equation by 1 to get x.
x=13
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