15+7x=78

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Solution for 15+7x=78 equation: 



15+7x=78

We move all terms to the left:

15+7x-(78)=0

We add all the numbers together, and all the variables

7x-63=0

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

7x=63

x=63/7

x=9

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