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(x+48)/2+(x+138)=180
We move all terms to the left:
(x+48)/2+(x+138)-(180)=0
We get rid of parentheses
(x+48)/2+x+138-180=0
We multiply all the terms by the denominator
(x+48)+x*2+138*2-180*2=0
We add all the numbers together, and all the variables
(x+48)+x*2-84=0
Wy multiply elements
(x+48)+2x-84=0
We get rid of parentheses
x+2x+48-84=0
We add all the numbers together, and all the variables
3x-36=0
We move all terms containing x to the left, all other terms to the right
3x=36
x=36/3
x=12
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