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(15+x)+(10+x)=240
We move all terms to the left:
(15+x)+(10+x)-(240)=0
We add all the numbers together, and all the variables
(x+15)+(x+10)-240=0
We get rid of parentheses
x+x+15+10-240=0
We add all the numbers together, and all the variables
2x-215=0
We move all terms containing x to the left, all other terms to the right
2x=215
x=215/2
x=107+1/2
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