4x=21-18

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Solution for 4x=21-18 equation: 



4x=21-18

We move all terms to the left:

4x-(21-18)=0

We add all the numbers together, and all the variables

4x-3=0

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

4x=3

x=3/4

x=3/4

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