100*0.3+x*0.7=85

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Solution for 100*0.3+x*0.7=85 equation: 



100*0.3+x*0.7=85

We move all terms to the left:

100*0.3+x*0.7-(85)=0

determiningTheFunctionDomain
x*0.7-85+100*0.3=0

We add all the numbers together, and all the variables

x*0.7-55=0

Wy multiply elements

0.7x-55=0

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

0.7x=55

x=55/0.7

x=78+0.40000000000001/0.7

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