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35-x+21-x+16-x+x=54
We simplify the equation to the form, which is simple to understand
35-x+21-x+16-x+x=54
We move all terms containing x to the left and all other terms to the right.
-1x-1x-1x+1x=+54-35-21-16
We simplify left and right side of the equation.
-2x=-18
We divide both sides of the equation by -2 to get x.
x=9
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