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2t = 6 | + 3
2t+3 = 9 | - 5t
-3t+3 = 9-5t | + 1
-3t+4 = 10-5t| × 2
-6t+8 = 20-10t
b) t = -1 |+ 4t
5t=-1+4t | - 3
5t-3 =-4+4t| + 2
5t-1 =-2+4t| × (-1)
-5t+1 = 2-4t| + 4
-5t+5 = 6-4t