12x+21-15x+3=30

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Solution for 12x+21-15x+3=30 equation:



12x+21-15x+3=30
We move all terms to the left:
12x+21-15x+3-(30)=0
We add all the numbers together, and all the variables
-3x-6=0
We move all terms containing x to the left, all other terms to the right
-3x=6
x=6/-3
x=-2

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