7x+12=3x=18

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Solution for 7x+12=3x=18 equation: 



7x+12=3x=18

We move all terms to the left:

7x+12-(3x)=0

We add all the numbers together, and all the variables

4x+12=0

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

4x=-12

x=-12/4

x=-3

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