40+30x=220

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Solution for 40+30x=220 equation: 



40+30x=220

We move all terms to the left:

40+30x-(220)=0

We add all the numbers together, and all the variables

30x-180=0

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

30x=180

x=180/30

x=6

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