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4x-30+3(x-1)=180
We move all terms to the left:
4x-30+3(x-1)-(180)=0
We add all the numbers together, and all the variables
4x+3(x-1)-210=0
We multiply parentheses
4x+3x-3-210=0
We add all the numbers together, and all the variables
7x-213=0
We move all terms containing x to the left, all other terms to the right
7x=213
x=213/7
x=30+3/7
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