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(.3x-28)+(.2x-41)=90
We move all terms to the left:
(.3x-28)+(.2x-41)-(90)=0
We get rid of parentheses
.3x+.2x-28-41-90=0
We add all the numbers together, and all the variables
0.5x-159=0
We move all terms containing x to the left, all other terms to the right
0.5x=159
x=159/0.5
x=318
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