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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