.40(15)+.20(12)+.40(x)=15

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Solution for .40(15)+.20(12)+.40(x)=15 equation: 



.40(15)+.20(12)+.40(x)=15

We move all terms to the left:

.40(15)+.20(12)+.40(x)-(15)=0

We add all the numbers together, and all the variables

.40x-14.3973=0

We move all terms containing x to the left, all other terms to the right

.40x=14.3973

x=14.3973/.40

x=35+0.3973/.40

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