3 уравнения 7 класс. Пожалуйста помагите
1) 5x + 3x - 3 = 6x + 11 8x - 6x = 11 + 3 2x = 14 x = 14/2 x = 7 2) 20x = 19 - 3 - 12x 20x + 12x = 16 32x = 16 x= 16/32 x = 1 / 2 x = 0,5 3) x - 7 - 2x - 9 = - 13 - x - 16 = - 13 - x = - 13 + 16 - x = 3 x = - 3
1) 5х + (3х-3)=6х+11 5х + 3х -3 =6х+11 8х-6х=11+3 2х=14 х=14:2=7 2) 20х=19-(3+12х) 20х= 19 -3 -12х 20x + 12x =16 32x= 16 x=16/32=1/2 3) (x-7)-(2x+9)=-13 x-7-2x-9=-13 -x-16=-13 -x=-13+16 -x=3 x=-3