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3x=x+9
2x=9
x=4,5
y+2y-5 = 11-y
3y-5=11-y
4y=16
y=4
3x-x=9
2x=9
x=4,5
y+2y-5=11-y
3y+y=11+5
4y=16
y=4
2x=9/:2
x=4,5
y+2y-5=11-y
y+2y+y=5+11
4y+16/:4
y=4