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120 - 75 = 1/2 x n
45 = 1/2 x n
n = (45 x 2) : 1
n = 90
b. 24 + 61 : 0,5 = (42,5 : n )
85 : 0,5 = 42,5 : n
170 = 42,5 : n
170 x n = 42,5
n = 42,5 : 170
n = 0,25