10x+12=13x+30=90

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Solution for 10x+12=13x+30=90 equation: 



10x+12=13x+30=90

We move all terms to the left:

10x+12-(13x+30)=0

We get rid of parentheses

10x-13x-30+12=0

We add all the numbers together, and all the variables

-3x-18=0

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

-3x=18

x=18/-3

x=-6

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