3x+40+7x=90

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Solution for 3x+40+7x=90 equation: 



3x+40+7x=90

We move all terms to the left:

3x+40+7x-(90)=0

We add all the numbers together, and all the variables

10x-50=0

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

10x=50

x=50/10

x=5

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