2x-16=26-2x
2x+2x=26+16
4x=42
x=42:4
x=10.5
А) ас+с-с=ас
б) 2b-2-2=2b-4
в) m+m²-m+1=m²+1
г) k+3-k=3
Решение
Ctg (pi/3-1/4x)=5/12
сtg(1/4x - π/3) = - 5/12
(1/4)x - π/3 = arctg(- 5/12) + πk, k ∈Z
(1/4)x = π/3 - arctg(5/12) + πk, k ∈Z
x = 4π/3 - 4arctg(5/12) + 4πk, k ∈Z