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3y-2y=-18
y=-18
- 5y=4y+10
5y-4y=10
y=10
- 7y+12=6y
7y-6y=-12
y=-12
9y-15=8y
9y-8y=15
y=15
- 3x + 8 = 4x - 5
3x-4x=-5-8
-x=-13
x=13
- 18x - 15 = 19x - 7
18x-19x=-7+15
-x=8
x=-8
- 14x - 10 = 15x + 7
14x-15x=7+10
-x=17
x=-17
- 3(2x + 7) = 5(x - 4)
6x+21=5x-20
6x-5x=-20-21
x=-41
- 2(5x - 6) = 3(3x - 7)
10x-12=9x-21
10x-9x=-21+12
x=-9
- 8(3/4y + 3/4) = 5(y + 4/5)
8 3/4y+ 8 3/4= 5y +5 4/5
8 3/4y-5y = 5 4/5- 8 3/4
3 3/4 y = 5 16/20 -8 15/20
3 3/4y= -2 4/20
y= -2 4/20 : 3 3/4
y = -44/20 : 15/4
y = -44/20×4/15
y= -44/75