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18=-0.2(x/7.5)
We move all terms to the left:
18-(-0.2(x/7.5))=0
We add all the numbers together, and all the variables
-(-0.2(+x/7.5))+18=0
We multiply all the terms by the denominator
-(-0.2(+x+18*7.5))=0
We calculate terms in parentheses: -(-0.2(+x+18*7.5)), so:We get rid of parentheses
-0.2(+x+18*7.5)
We add all the numbers together, and all the variables
-0.2(x+135)
We multiply parentheses
-0.2x-27
Back to the equation:
-(-0.2x-27)
0.2x+27=0
We move all terms containing x to the left, all other terms to the right
0.2x=-27
x=-27/0.2
x=-135
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