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2x-10-3=-9
2x=10+3-9
2x=4
x=2
2.(X-5)-3=9 2.(11-5)-3=9
2.X-2.5-3=9 2.11-2.5-3=9
2X-10=9+3 22-10-3=9
2X=12+10 12-3=9
X=22:2 9=9
X=11