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40x+60x-120=380
We simplify the equation to the form, which is simple to understand
40x+60x-120=380
We move all terms containing x to the left and all other terms to the right.
+40x+60x=+380+120
We simplify left and right side of the equation.
+100x=+500
We divide both sides of the equation by 100 to get x.
x=5
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