2(х+3)=х+13 4(5-х)=3х-1 3(х-2)=х+4 5(х-1)=4х+3

2(х+3)=х+13 2х+6=х+13 2х-х=13-6 х=7 4(5-х)=3х-1 20-4х=3х-1 -4х-3х=-20-1 -7х=-21 х=3 3(х-2)=х+4 3х-6=х+4 3х-х=4+6 2х=10 х=5 5(х-1)=4х+3 5х-5=4х+3 5х-4х=3+5 х=8