What does l. h.m. s.l. d.k. y mean in text?
Somebody answer ASAP

The transitive property of equality states that: o if a = b, then bra o if a = b, then ac = bc o if a = b and b= c, then a = if a = b and c= c, then a + b = b + c

What is the value of x when x + 7 = 21?

Y=(x+3)(x-4)(x+1)^2 sulutions? multiplicity?