Решите уровнение( 12m-15m)•4=252
(12m -15m)*4 = 252 -3m*4 = 252 - 12 m = 252 m = 252 : (-12) m = - 21 -------------- (12*(-21)-15*(-21))*4 = 252 (-252 + 315)*4 = 252 63*4 = 252 252 = 252