0.4x+12=-2.1x-3

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Solution for 0.4x+12=-2.1x-3 equation: 



0.4x+12=-2.1x-3

We move all terms to the left:

0.4x+12-(-2.1x-3)=0

We get rid of parentheses

0.4x+2.1x+3+12=0

We add all the numbers together, and all the variables

2.5x+15=0

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

2.5x=-15

x=-15/2.5

x=-6

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