80*0.3+x*0.7=100

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Solution for 80*0.3+x*0.7=100 equation: 



80*0.3+x*0.7=100

We move all terms to the left:

80*0.3+x*0.7-(100)=0

determiningTheFunctionDomain
x*0.7-100+80*0.3=0

We add all the numbers together, and all the variables

x*0.7-76=0

Wy multiply elements

0.7x-76=0

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

0.7x=76

x=76/0.7

x=108+0.40000000000001/0.7

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