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sergey [27]
4 years ago
11

3t+u=561

Mathematics
1 answer:
fgiga [73]4 years ago
8 0
Look, solve it first for" b "
u=561 - 3t
t =906 - 7b
So, 2b+7(906 -7b)+5(561 - 3(906-7b)=1758
gain the b then substitute by the result in the second equation then gain the value of t and solve the first equation.
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