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x+(2x+0.15)+(x+0.5)=18
We move all terms to the left:
x+(2x+0.15)+(x+0.5)-(18)=0
We get rid of parentheses
x+2x+x+0.15+0.5-18=0
We add all the numbers together, and all the variables
4x-17.35=0
We move all terms containing x to the left, all other terms to the right
4x=17.35
x=17.35/4
x=4+1/2.962962962963
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