2,5x=-7,5
х=-7,5/2,5
х=-3
3x-13,5=0
3х=13,5
х=13,5/3
х=4,5
4y+2=8+5y
2-8=5у-4у
у=-6
|x+5|=6
х=6-5
х=1
(2x+3)/(x²+x-12)-1/2≤0
(4x+6-x²-x+12)/(x²+x-12)≤0
(-x²+3x+18)/(x²+x-12)≤0
(x²-3x-18)/(x²+x-12)≤0
(x-6)(x+3)/(x+4)(x-3)≤0
x=6 x=-3 x=-4 x=3
+ _ + _ +
------(-4)--------[-3]---------(3)--------[6]-------
x∈(-4;-3] U (3;6]