1) (4х+1)/11 = 50/22 2) 39/57 = 13/(8х-5)
22 : 11 = 2 - доп.множ. 39 : 13 = 3 - доп.множ.
2 * (4х + 1) = 50 3 * (8х - 5) = 57
4х + 1 = 50 : 2 8х - 5 = 57 : 3
4х + 1 = 25 8х - 5 = 19
4х = 25 - 1 8х = 19 + 5
4х = 24 8х = 24
х = 24 : 4 х = 24 : 8
х = 6 х = 3
3) 72/60 = 18/(4х+7) 4) (5х-6)/9 = 70/45
72 : 18 = 4 - доп.множ. 45 : 9 = 5 - доп.множ.
4 * (4х + 7) = 60 5 * (5х - 6) = 70
4х + 7 = 60 : 4 5х - 6 = 70 : 5
4х + 7 = 15 5х - 6 = 14
4х = 15 - 7 5х = 14 + 6
4х = 8 5х = 20
х = 8 : 4 х = 20 : 5
х = 2 х= 4