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t in (-oo:+oo)
2*t+7*t-(2/7) = -443/7 // + -443/7
2*t+7*t-(2/7)-(-443/7) = 0
2*t+7*t-2/7+443/7 = 0
9*t+63 = 0 // - 63
9*t = -63 // : 9
t = -63/9
t = -7
t = -7
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