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2x=30+10
2x=40/:2
x=20
2) -10+5x=10
5x=10+10
5x=20/:5
x=4
3) 6y+18=24
6y=24-18
6y=6/:6
y=1
4) 5x-25=50
5x=50-25
5x=25/:5
x=5
5) 3-x-20=50
3-x=50-20
-x=30-3
-x=27/:-1
x=-27
6) 50-30y=80
-30y=80-50
-30y=30/:-30
y=-1
7) 2-+15x=45
8) 15-3x=45
-3x=30/:-3
x=-10
2x=40 /:2
x=20
2) -10+5x=10 /+10
5x=20 /:5
x=4
3)6y+18=24 /-18
6y=6 /:6
y=1
4)5x-25=50 /+25
5x=75 /:5
x=15
5) 3-x-20 =50
-17-x=50 /+17
-x=67 /*(-1)
x= -67
6)50-30y=80 /-50
-30y =30 /:(-30)
y= -1
7)2+15x=45 /-2
15x=43 /:15
x=43/15=2 13/15
8)15-3x=45 /-15
-3x= 30 /:(-3)
x= -10