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3√3x<15
√3x<5
x<5/√3
x<5√3/3
b)√2x+4<2√2x-8
12<√2x
12√2/2<x
x>6√2
c)√5x*3x<5√5-2 2/3
3√5x<5√5-2 2/3
x<(5√5-2 2/3)/3√5
x<[(5√5-2 2/3)√5]/15
x<(25-2 2/3√5)/15
x<25/15 - 8/3√5*1/15
x<5/3-8/3√5 * 1/15
x< 5/3- 8/45√5