42+12x=90

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Solution for 42+12x=90 equation: 



42+12x=90

We move all terms to the left:

42+12x-(90)=0

We add all the numbers together, and all the variables

12x-48=0

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

12x=48

x=48/12

x=4

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