x-4+x+8=90

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Solution for x-4+x+8=90 equation: 



x-4+x+8=90

We move all terms to the left:

x-4+x+8-(90)=0

We add all the numbers together, and all the variables

2x-86=0

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

2x=86

x=86/2

x=43

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