42+2x=90

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Solution for 42+2x=90 equation: 



42+2x=90

We move all terms to the left:

42+2x-(90)=0

We add all the numbers together, and all the variables

2x-48=0

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

2x=48

x=48/2

x=24

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