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3y-5=y-9 /+5
3y=y-9+5 /-y
3y-y=-4
2y= -4/:2
y=-2
2.
3x+15=3-x /-15
3x=3-x-15 /+x
3x+x=-12
4x= -12 /:4
x= -3
3.
4z=7-7z /+7z
4z+7z=7
11z=7 /:11
z=7/11
4.
4-12y=10y /+12y
4=10y+12y
4=22y
22y=4 /:22
y4/22=2/11