7x+13=90.12x-18=30.10x+40=100

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Solution for 7x+13=90.12x-18=30.10x+40=100 equation: 



7x+13=90.12x-18=30.10x+40=100

We move all terms to the left:

7x+13-(90.12x-18)=0

We get rid of parentheses

7x-90.12x+18+13=0

We add all the numbers together, and all the variables

-83.12x+31=0

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

-83.12x=-31

x=-31/-83.12

x=31/83.12

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