УПРОСТИТE ВЫРАЖEНИЯ :
2(х+3)+5(х+1)
9(7+у)+8(6+у)
4(3х+23)+7(6+5х)
12(9+8у)+3(11+6у)

2(х+3)+5(х+1)=2*х+2*3+5*х+5*1=7х+11 9(7+у)+8(6+у)=9*7+9*у+8*6+8*у=111+17у 4(3х+23)+7(6+5х)=4*3х+4*23+7*6+7*5х=47х+134 12(9+8у)+3(11+6у)=12*9+12*8у+3*11+3*6у=114у+141