Решите уравнение:x+9=-x/2
X + 9 = - x/2 /*2 2 (x+ 9) = - x 2x + 18 = - x 2x + x = - 18 3x = - 18 x = - 6
X+9=-x/2 2x+2*9=-2*(x/2) 2x+18=-x 2x+x=-18 3x=-18 x=-18:3 x=-6