12+x+x+15=19

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Solution for 12+x+x+15=19 equation: 



12+x+x+15=19

We move all terms to the left:

12+x+x+15-(19)=0

We add all the numbers together, and all the variables

2x+8=0

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

2x=-8

x=-8/2

x=-4

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