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(18-7x)+(42+10x)=149
We move all terms to the left:
(18-7x)+(42+10x)-(149)=0
We add all the numbers together, and all the variables
(-7x+18)+(10x+42)-149=0
We get rid of parentheses
-7x+10x+18+42-149=0
We add all the numbers together, and all the variables
3x-89=0
We move all terms containing x to the left, all other terms to the right
3x=89
x=89/3
x=29+2/3
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