Răspuns:
Explicație pas cu pas:
a) 2(x + 3) = 28, 2x + 6 = 28, 2x = 22, x = 11
b) 18 = 3(x + 5), 3x + 15 = 18, 3x = 3, x = 1
c) 3(x - 7) = 36, 3x - 21 = 36, 3x = 57, x = 19
d) 3(x + 5) = 45, 3x + 15 = 45, 3x = 30, x = 10
e) 4(5x - 2) = 7(2x + 4), 20x - 8 = 14x + 28, 6x = 36, x = 6
