42+8+5x=90

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Solution for 42+8+5x=90 equation: 



42+8+5x=90

We move all terms to the left:

42+8+5x-(90)=0

We add all the numbers together, and all the variables

5x-40=0

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

5x=40

x=40/5

x=8

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