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x+3x+(3x-45)=180
We move all terms to the left:
x+3x+(3x-45)-(180)=0
We add all the numbers together, and all the variables
4x+(3x-45)-180=0
We get rid of parentheses
4x+3x-45-180=0
We add all the numbers together, and all the variables
7x-225=0
We move all terms containing x to the left, all other terms to the right
7x=225
x=225/7
x=32+1/7
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