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x=12-5
x=7
b)
x=2+2
x=4
lub
x=1+2
x=3
Chyba źle to sformułowałeś
x=7
b)|x-2|< 3/+2
x<5
c) (x-3)²-(x-2)(x+3)=1-5(2x-1)
(x-3)(x-3)-(x2+3x-2x-6)= 1-10x+5
x2-3x-3x+9-x2-3x+2x+6=1-10x+5
3x=-9/:3
x=-3