100=x+13

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Solution for 100=x+13 equation: 



100=x+13

We move all terms to the left:

100-(x+13)=0

We get rid of parentheses

-x-13+100=0

We add all the numbers together, and all the variables

-1x+87=0

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

-x=-87

x=-87/-1

x=+87

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