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2×(3t-5+12)=2*(3t+7)=6t+14
(12t-2-6t):(-2)= (6t-2):(-2)=-3t+1
2x(3t-5+12)= 6xt + (2x*(-5)) + (2x * 12) = 6xt -10x +24x
(12t-2-6t): (-2) = (12t : (-2)) - (2: (-2)) - (6t : (-2)) = -6t -(-1) - (-3t)= -6t +1 + 3t = -3t +1