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3x+30=180-50+4x
We move all terms to the left:
3x+30-(180-50+4x)=0
We add all the numbers together, and all the variables
3x-(4x+130)+30=0
We get rid of parentheses
3x-4x-130+30=0
We add all the numbers together, and all the variables
-1x-100=0
We move all terms containing x to the left, all other terms to the right
-x=100
x=100/-1
x=-100
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