Răspuns:
Explicație pas cu pas:
25/15 = (x + 7)/6 = 30/(4z + 2) = 3y/45
25/15 = (x + 7)/6
6*25 = 15*(x + 7)
150 = 15x + 105
15x = 150 - 105 = 45
x = 45 : 15 = 3
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25/15 = 30/(4z + 2)
25*(4z + 2) = 15*30
100z + 50 = 450
100z = 450 - 50 = 400
z = 400 : 100 = 4
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25/15 = 3y/45
25*45 = 15*3y = 45y
y = 25*45/45 = 25