78=x+15

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Solution for 78=x+15 equation: 



78=x+15

We move all terms to the left:

78-(x+15)=0

We get rid of parentheses

-x-15+78=0

We add all the numbers together, and all the variables

-1x+63=0

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

-x=-63

x=-63/-1

x=+63

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