0.4a+0.9*300=0.7(a+300)

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Solution for 0.4a+0.9*300=0.7(a+300) equation: 



0.4a+0.9*300=0.7(a+300)

We move all terms to the left:

0.4a+0.9*300-(0.7(a+300))=0

We add all the numbers together, and all the variables

0.4a-(0.7(a+300))+270=0



We calculate terms in parentheses: -(0.7(a+300)), so:

0.7(a+300)

We multiply parentheses

0.7a+210

Back to the equation:

-(0.7a+210)



We get rid of parentheses

0.4a-0.7a-210+270=0

We add all the numbers together, and all the variables

-0.3a+60=0

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

-0.3a=-60

a=-60/-0.3

a=+200

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