Привидите подобные слагаемые 7х-8+5х= х-5+3х= -7+9+7х х+2-4х+ -8х-7+8х
1) 7x-8+5x = (7-8+5)*x = 4x 2) x-5+3x = (1-5+3)*x = -1x 3) -7+9+7x = (-7+9+7)*x = 9x 4) x+2-4x = (1+2-4)*x = -1x 5) -8x-7+8x = (-8-7+8)*x = -7x