40-x+3x=90

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



40-x+3x=90

We move all terms to the left:

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

We add all the numbers together, and all the variables

2x-50=0

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

2x=50

x=50/2

x=25

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