1)(8z -1)/5 - (50 -2z)/9 = (3z + 3)/4 + 1| * 5*9*4
36(8z -1) - 20(50 - 2z) = 45(3z +3) + 180
288z -36 -1000+40z = 135z + 135 + 180
328z = 1351
z = 7
2) (8c -1)/7 -12 = (2с -5)/3 - (4с -1)/5 | * 7*3*5
15(8c -1) - 1260 = 35(2c -5) - 21(4c -1)
120c -15 -1260 = 70c - 175 - 84c +21
134c = 1121
c = 1121/134