0,87x-0,9x+1,3x=-15,24
0,87x-0,9x+1,3x=-15,24 x*( 0.87 - 0.9 + 1.3 ) = -15.24 1.27*x = - 15.24 x = - 15.24/1.27 x = - 12
0.87x-0.9z+1.3x=-15.24 x=-12