.9x+.8x=5.1

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Solution for .9x+.8x=5.1 equation: 



.9x+.8x=5.1

We move all terms to the left:

.9x+.8x-(5.1)=0

We add all the numbers together, and all the variables

1.7x-5.1=0

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

1.7x=5.1

x=5.1/1.7

x=3

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