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(20+.5x)+.15(20+.5x)=62.1
We move all terms to the left:
(20+.5x)+.15(20+.5x)-(62.1)=0
We add all the numbers together, and all the variables
(.5x+20)+.15(.5x+20)-(62.1)=0
We add all the numbers together, and all the variables
(.5x+20)+.15(.5x+20)-62.1=0
We multiply parentheses
(.5x+20)+0.15x+3-62.1=0
We get rid of parentheses
.5x+0.15x+20+3-62.1=0
We add all the numbers together, and all the variables
0.65x-39.1=0
We move all terms containing x to the left, all other terms to the right
0.65x=39.1
x=39.1/0.65
x=60+0.1/0.65
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