7x-4+7x-4+7x-4+7x-4+7x-4=120

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



7x-4+7x-4+7x-4+7x-4+7x-4=120

We move all terms to the left:

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

We add all the numbers together, and all the variables

35x-140=0

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

35x=140

x=140/35

x=4

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