4x-66+15=21

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Solution for 4x-66+15=21 equation: 



4x-66+15=21

We move all terms to the left:

4x-66+15-(21)=0

We add all the numbers together, and all the variables

4x-72=0

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

4x=72

x=72/4

x=18

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