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540=390+1,5x
We simplify the equation to the form, which is simple to understand
540=390+1,5x
We move all terms containing x to the left and all other terms to the right.
-1.5x=+390-540
We simplify left and right side of the equation.
-1.5x=-150
We divide both sides of the equation by -01.5 to get x.
x=100
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