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77=70+70(0.02)t
We move all terms to the left:
77-(70+70(0.02)t)=0
We calculate terms in parentheses: -(70+70(0.02)t), so:We get rid of parentheses
70+70(0.02)t
determiningTheFunctionDomain 70(0.02)t+70
We multiply parentheses
1.4t+70
Back to the equation:
-(1.4t+70)
-1.4t-70+77=0
We add all the numbers together, and all the variables
-1.4t+7=0
We move all terms containing t to the left, all other terms to the right
-1.4t=-7
t=-7/-1.4
t=+5
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