3a+2.1+4.a=-0.7

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Solution for 3a+2.1+4.a=-0.7 equation: 



3a+2.1+4.a=-0.7

We move all terms to the left:

3a+2.1+4.a-(-0.7)=0

We add all the numbers together, and all the variables

7a+2.8=0

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

7a=-2.8

a=-2.8/7

a=-2.8/7

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