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2014-01-27T17:28:46+02:00
[(2*x)/19]*57 = 18 => (2*x)*3 = 18 => 2*x = 6 => x = 3.
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2014-01-27T17:30:30+02:00
(2x/19)*57=18
(2x/19)*(3*19)=18
(2x*3*19)/19=18
2x*3=18
6x=18
=> x=18/6
x=3
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