Răspuns:
Explicație pas cu pas:
(4x - 7)/(5x - 3) = 25/37
37*(4x - 7) = 25*(5x - 3)
148x - 259 = 125x - 75
148x - 125x = 259 - 75
23x = 184
x = 184 : 23 = 8
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(4x + 27)/(8x + 45) = 7/13
13*(4x + 27) = 7*(8x + 45)
52x + 351 = 56x + 315
351 - 315 = 56x - 52x
36 = 4x
x = 36 : 4 = 9
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(6x +7)/(5x + 21) = 7/8
8*(6x + 7) = 7*(5x + 21)
48x + 56 = 35x + 147
48x - 35x = 147 - 56
13x = 91
x = 91 : 13 = 7
