[tex]20t - 30 = 10t + 40[/tex]
[tex]20t - 10t = 40 + 30[/tex]
[tex]10t = 70[/tex]
[tex]t = \frac{70}{10} [/tex]
[tex]t = 7[/tex]
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[tex]20t - 30 = 10t + 40[/tex]
[tex]20t - 10t = 40 + 30[/tex]
[tex]10t = 70[/tex]
[tex]t = \frac{70}{10} [/tex]
[tex]t = 7[/tex]
nilai t adalah 7