Помогите пожалуйста
1) 2x+3 =49; 2x = 46; x= 23; 2)x - 7 = 3x - 8; - 2x =1; x = -/2; 3) 3x+5x= 2x - 4; x = -9; 4) x =+- π/6+2πn,n∈Z; 5) = 6) 3·1 -√3/2+1/2 = 7√3/2; 7) = =√83; 8) = sin65·cos35 - cos65sin35;