1.2x+7.5x+2.1=6.3

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Solution for 1.2x+7.5x+2.1=6.3 equation: 



1.2x+7.5x+2.1=6.3

We move all terms to the left:

1.2x+7.5x+2.1-(6.3)=0

We add all the numbers together, and all the variables

8.7x-4.2=0

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

8.7x=4.2

x=4.2/8.7

x=1/2.0714285714286

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