7x+4+8x-4=120

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Solution for 7x+4+8x-4=120 equation: 



7x+4+8x-4=120

We move all terms to the left:

7x+4+8x-4-(120)=0

We add all the numbers together, and all the variables

15x-120=0

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

15x=120

x=120/15

x=8

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