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t in (-oo:+oo)
7*(3*t+10) = 133 // - 133
7*(3*t+10)-133 = 0
7*(3*t+10)-133 = 0
21*t-63 = 0
21*t-63 = 0
21*t-63 = 0 // + 63
21*t = 63 // : 21
t = 63/21
t = 3
t = 3
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