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(a-38)+(a-48)+40=180
We move all terms to the left:
(a-38)+(a-48)+40-(180)=0
We add all the numbers together, and all the variables
(a-38)+(a-48)-140=0
We get rid of parentheses
a+a-38-48-140=0
We add all the numbers together, and all the variables
2a-226=0
We move all terms containing a to the left, all other terms to the right
2a=226
a=226/2
a=113
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