2x+30+40=40

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Solution for 2x+30+40=40 equation: 



2x+30+40=40

We move all terms to the left:

2x+30+40-(40)=0

We add all the numbers together, and all the variables

2x+30=0

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

2x=-30

x=-30/2

x=-15

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