To differentiate something you multiply the power on the x with the number in front of it and then reduce the power by one
in this case:
12x is the same as 12x^1
so the derivitive is 12*1*x^0
which is just 12
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12x-17x = -5
12x - 2x = 10
(75y - 12x^2) * y = 75y^2 -12x^2y 75y - (12x^2 * y) = 75y -12x^2y
12x - 8 = 10x + 42x = 12x = 6
x2+12x+5 = 3 x2+12x+5-3 = 0 x2+12x+2 = 0