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2x/5+x/2=9
4x/10+5x/10=9
(4x+5x)/10=9
4x+5x=90
9x=90
x=90/9
x=10
2(x+5)-x=4x+11
2x+10-x=4x+11
x+10=4x+11
x-4x=11-10
-3x=1
x=-⅓
2/x=3/x+2
2/x-3/x=2
-1/x=2
2x=-1
x=-½
9x/10=9
9x=9.10
9x=90
x=10