12.8=2x+3

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Solution for 12.8=2x+3 equation: 



12.8=2x+3

We move all terms to the left:

12.8-(2x+3)=0

We get rid of parentheses

-2x-3+12.8=0

We add all the numbers together, and all the variables

-2x+9.8=0

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

-2x=-9.8

x=-9.8/-2

x=4+1/1.11111111111

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