в) 4(6х-5)-5(2х-3)=51
24х-20-10х+15=51
14х=56
х=56/14
х=4
г) 3(3х+1)-4(х-4)=29
9х+3-4х+16=29
5х=10
х=10/5
х=2
д) 5(7-2х)-4(3-5х)=53
35-10х-12+20х=53
10х=30
х=30/10
х=3
