-2х+10+3х-12=4х+1 х-2=4х+1 х-4х=1+2 -3х=3 х=-1
-2(х-5)+3(х-4)=4х+1 -2х+10+3х-12=4х+1 -2х+3х-4х=1+12-10 -3х=2 -х-1 */1 х=1
1+12-10= 3 вообще то