3×( 2.9р - 1.9 m ) + 2 * (2.3p + 0.7m ) =
3*( 2.9р - 1.9 m ) + 2 * (2.3p + 0.7m ) =8,7p-5,7m+4,6p+1,4m= 13,3p-4,3m