3(5t-6)-2(9t-12)=4(8t-15)-12
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3(5t-6) -2(9t-12) =4(8t-15) -12
15t-18-18t+24=32t-60-12
6-3t=32t-72
78=35t
t=78/35
15t-18-18t+24=32t-60-12
6-3t=32t-72
78=35t
t=78/35
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