0,5(х+1)-2х=6(х+1)-8
0,5х+0,5-2х=6х+6-8
7,5х=2,5
1,5х=0,5
х=1/3
а = 75 + 0.75в, а = 75 + 0.75(50 + 0.5а), а = 75 + 37.5 + 0.375а,
в = 50 + 0.5а; в = 50 + 0.5а; в = 50 + 0.5а;
0.625а = 112.5, а = 180, а = 180,
в = 50 + 0.5а; в = 50 + 90; в = 140.
2x - ay + bz
a = 3c
b = 14c^3
x = 5c^3 + 2
y = 6c^2 - c + 13
z = 5c - 1
2(5c^3 + 2) - 3c*(6c^2 - c + 13) + 14c^3*(5c - 1) =
= 10c^3 + 4 - 3c*6c^2 + 3c*c - 39c + 70c^4 - 14c^3 =
= 10c^3 + 4 - 18c^3 + 3c^2 - 39c + 70c^4 - 14c^3 =
= 70c^4 - 22c^3 + 3c^2 - 39c + 4