Resposta:
S = {x∈R| [tex]x\geq 1[/tex]}, S = {x∈R| [tex]x<\frac{12}{7}[/tex]} e S = {x∈R| [tex]x>-9[/tex]}
Explicação passo a passo
a)[tex]2x+5\geq -3x+10\\2x +3x\geq 10-5\\5x\geq 5\\x\geq \frac{5}{5}\\x\geq 1[/tex]
S = {x∈R| [tex]x\geq 1[/tex]}
b) [tex]-3+5x<-2x+9\\5x+2x<9+3\\7x<12\\x<\frac{12}{7}[/tex]
S = {x∈R| [tex]x<\frac{12}{7}[/tex]}
c)[tex]15+20x>18x-3\\20x-18x>-3-15\\2x>-18\\x>-\frac{18}{2}\\x>-9[/tex]
S = {x∈R| [tex]x>-9[/tex]}
Espero ter ajudado :)
