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26*30-x=660
We simplify the equation to the form, which is simple to understand
26*30-x=660
Simplifying:
+780-x=660
We move all terms containing x to the left and all other terms to the right.
-1x=+660-780
We simplify left and right side of the equation.
-1x=-120
We divide both sides of the equation by -1 to get x.
x=120
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