15-y/4>10
15-10>y/4 [add y/4-10 to both sides]
5>y/4 [simplify lhs]
20>y [multiply by 4]
y<20 [move y to lhs]
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You simplify by finding a common factor of the two numbers greater than 1. In other words, you look for another number (greater than 1) which evenly divides into both the numbers in the fraction. 21 and 28 both divide by 7 to give 3 and 4 respectively. So we can simplify to 3/4.
-2
2
X is less than or equal to 4.
No, you cannot simplify it any more than that.