4x=15-21

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Solution for 4x=15-21 equation: 



4x=15-21

We move all terms to the left:

4x-(15-21)=0

We add all the numbers together, and all the variables

4x-(-6)=0

We add all the numbers together, and all the variables

4x+6=0

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

4x=-6

x=-6/4

x=-1+1/2

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