12 = - 3t + 9
subtract 9 from each side
12 - 9 = -3t + 9 - 9
3 = - 3t
divide both sides integers by - 3
3/- 3 = (- 3/ - 3)t
- 1 = t
=======check in original equation
12 = - 3(- 1) + 9
12 = 3 + 9
12 = 12
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8
t = -11/10
2t - 12 - 3t = 60 -1t - 12 = 60 -1t -12 +12 = 60 + 12 -1t = 72 t = -72
15t+25 = 5(3t+5)
Yes and t = 1 in both equations