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3x+10+x-30+4x-40=360

We move all terms to the left:

3x+10+x-30+4x-40-(360)=0

We add all the numbers together, and all the variables

8x-420=0

We move all terms containing x to the left, all other terms to the right

8x=420

x=420/8

x=52+1/2

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