100=7.50x+0.40x

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Solution for 100=7.50x+0.40x equation: 



100=7.50x+0.40x

We move all terms to the left:

100-(7.50x+0.40x)=0

We add all the numbers together, and all the variables

-(+7.9x)+100=0

We get rid of parentheses

-7.9x+100=0

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

-7.9x=-100

x=-100/-7.9

x=12+4.3333333333334/6.5833333333334

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