40x=140-30x

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Solution for 40x=140-30x equation: 



40x=140-30x

We move all terms to the left:

40x-(140-30x)=0

We add all the numbers together, and all the variables

40x-(-30x+140)=0

We get rid of parentheses

40x+30x-140=0

We add all the numbers together, and all the variables

70x-140=0

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

70x=140

x=140/70

x=2

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