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(20x+1)+(15x+4)=180
We move all terms to the left:
(20x+1)+(15x+4)-(180)=0
We get rid of parentheses
20x+15x+1+4-180=0
We add all the numbers together, and all the variables
35x-175=0
We move all terms containing x to the left, all other terms to the right
35x=175
x=175/35
x=5
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