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2x≤18
x≤9
no 7. 5x+9>7x+6
3>2x
1.5>x
no 8 2x+6+4=3-3x
5x=-7
x=-7/5
no 9 6x-21≤4x+8
2x≤29
x≤14.5
no 10 yang no 10 kurang jelas