Răspuns:
Explicație pas cu pas:
(x - 2)/x = 7/13
13(x - 2) = 7x
13x - 26 = 7x
13x - 7x = 26
6x = 26
x = 26/6 = 13/3
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3(3x + 4) = 5(x + 5)
9x + 12 = 5x + 25
9x - 5x = 25 - 12
4x = 13
x = 13/4
7(4x - 3) = 11(2x + 5)
28x - 21 = 22x + 55
28x - 22x = 55 + 21
6x = 76
x = 76/6 = 38/3
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4(x + 1) = 0,5(2x + 8)
4x + 1 = x + 4
4x - x = 4 - 1
3x = 3
x = 3/3 = 1
