Rozwiąż równania: a) 12y-(y+5)=10y-1 b) 2(u-5)+15=3(u-4)+10 c) -3(y/3+1)-2=4(1-y) d) 2(3a-2)-6=4,5(2a-1)+1/2

a) 12y-(y+5)=10y-1 12y-y-5=10y-1 12y-y-10y=5-1= y=4 b) 2(u-5)+15=3(u-4)+10 2u-10+15=3u-12+10 2u-3u=10-15-12+10 -u=-7 |:(-1) u=7 c) -3(y/3+1)-2=4(1-y) -1y-3-2=4-4y -y+4y=4+3+2 3y=9 |:3 y=3 d) 2(3a-2)-6=4,5(2a-1)+1/2 6a-4-6=9a-4,5+0,5 6a-9a=-4,5+0,5+4+6 -3a=14

a) 12y-y-5=10y-1 11y-5=10y-1 11y-10y=5-1 y=4 b)2u -10+15=3u-12+10 2u+5=3u-2 2u-3u= -2-5 -u= -7   /*(-1) u=7 c) (-3y/3+1)-2 =4-4y -3y/4 -2=4-4y      /*4 -3y -8=16-16y -3y+16y=16 +8 13y= 24   /;13 y=24/13 d) 6a -4 -6 = 9a -4,5 +1/2 6a - 9a =  -4,5+1/2 +4+6 -3a = -5,5+1/2 -3a = -5 /;(-3) a= 5/3 licze na naj ;)