(x-12.4)+x=90

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Solution for (x-12.4)+x=90 equation: 



(x-12.4)+x=90

We move all terms to the left:

(x-12.4)+x-(90)=0

We add all the numbers together, and all the variables

x+(x-12.4)-90=0

We get rid of parentheses

x+x-12.4-90=0

We add all the numbers together, and all the variables

2x-102.4=0

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

2x=102.4

x=102.4/2

x=51+0.40000000000001/2

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