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0.4t=0.9(18-t)=12.7
We move all terms to the left:
0.4t-(0.9(18-t))=0
We add all the numbers together, and all the variables
0.4t-(0.9(-1t+18))=0
We calculate terms in parentheses: -(0.9(-1t+18)), so:We get rid of parentheses
0.9(-1t+18)
We multiply parentheses
-0.9t+16.2
Back to the equation:
-(-0.9t+16.2)
0.4t+0.9t-16.2=0
We add all the numbers together, and all the variables
1.3t-16.2=0
We move all terms containing t to the left, all other terms to the right
1.3t=16.2
t=16.2/1.3
t=12+0.6/1.3
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