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.30(12)+.05x=.15(18+x)
We simplify the equation to the form, which is simple to understand
.30(12)+.05x=.15(18+x)
Reorder the terms in parentheses
+(+3.6)+.05x=.15*(18+x)
Remove unnecessary parentheses
+3.6+.05x=+.15+*(+18+x+)
Reorder the terms in parentheses
+3.6+.05x=+(+2.7 + 0.15x)
Remove unnecessary parentheses
+3.6+.05x=+2.7 + 0.15x
We move all terms containing x to the left and all other terms to the right.
+ 0.05x-0.15x=+2.7-3.6
We simplify left and right side of the equation.
-0.1x=-0.9
We divide both sides of the equation by -0.1 to get x.
x=9
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