1)4×(2x-3)+5=5x-1
8x-12+5=5x-1
8x-5x=-1+7
3x=6
x=2
3)2×(3x-1)+9=5-7x
6x-2+9=5-7x
6x+7x=5-7
13x=-2
x=-2/13
Tg 2x1 = √3
tg 2x2 = - √3
2x1 = π/3+πn, n∈Z
x1 = π/6 + πn/2, n∈Z
2x2 = - π/3 + πn , n∈Z
x2 = - π/6 + πn, n∈Z
X - 8y = -4
2x - 21y = 2
x = 8y - 4
2(8y - 4) - 21y = 2
x = 8y - 4
16y - 21y - 8 = 2
x = 8y - 4
-5y = 10
y = -2
x = -16 - 4 = -20
Ответ: (-20; -2).
f(-x)=(-x)^11=-x^11=-f(x) нечетная