It's just like solving algebra: [(J/4)-8] < (4) (J/4) < (12) (J) < (12*3) J < 48 The inequality is true when J is less than 48.
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x/4 - (9 - 3) =x/4 - 6
14/20 minus 3/5 is 1/10
x/3 - 7 = 2=> x/3 = 9 (add 7 to both sides) => x = 27 (multiply both sides by 3).
4 over 10
plus or minus. You see it often with square roots. The square root of 9 is plus or minus 3.