4x+8x+21=28x+12-3

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Solution for 4x+8x+21=28x+12-3 equation: 



4x+8x+21=28x+12-3

We move all terms to the left:

4x+8x+21-(28x+12-3)=0

We add all the numbers together, and all the variables

4x+8x-(28x+9)+21=0

We add all the numbers together, and all the variables

12x-(28x+9)+21=0

We get rid of parentheses

12x-28x-9+21=0

We add all the numbers together, and all the variables

-16x+12=0

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

-16x=-12

x=-12/-16

x=3/4

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