4x+15=100-x

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Solution for 4x+15=100-x equation: 



4x+15=100-x

We move all terms to the left:

4x+15-(100-x)=0

We add all the numbers together, and all the variables

4x-(-1x+100)+15=0

We get rid of parentheses

4x+1x-100+15=0

We add all the numbers together, and all the variables

5x-85=0

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

5x=85

x=85/5

x=17

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