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.80x - .30 (40 + x ) =.70 (40)
We simplify the equation to the form, which is simple to understand
.80x-.30(40+x)=.70(40)
Reorder the terms in parentheses
.80x+(-12-0.3x)=.70*(40)
Remove unnecessary parentheses
+.80x-12-0.3x=+.70+*(+40+)
Reorder the terms in parentheses
.80x-12-0.3x=+(+28)
Remove unnecessary parentheses
+.80x-12-0.3x=+28
We move all terms containing x to the left and all other terms to the right.
+ 0.8x-0.3x=+28+12
We simplify left and right side of the equation.
+ 0.5x=+40
We divide both sides of the equation by 0.5 to get x.
x=80
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