Question

решите уравнение .....

Answer 1

5x+2=18-3x
5x+3x=18-2
8x=16
x=2

Answer 2

а) 5х + 3х = 18+2 => 8x=20 => x=2,5;
б) 2/3 x +3/3 x = -5/10 => 5/3 x = -5/10 => x=-0,3 или -3/10
в) 2,8/4,2 = 2/3; (x+1)/3=2/3 => x+1 = 2 => x=1