4[9+6(m-7)]=8
(folosim distributivitatea)
4(9+6m-42)=8
(folosim distributivitatea)
36+24m-168=8 /+168
36+24m=174/-36
24m=138/:24
m=5,75
(x+9)/9=6-(x+4)/5
(Separam termenii cu necunoscuta de termenii liberi)
(x+9)/9+(x+4)/5=6
(aducem la același numitor 45,amplificand cu 5, respectiv 9)
5(x+9)/45+9(x+4)/45=6
(folosim distributivitatea)
5x+45/45+9x+36/45=6
14x+81/45=6/*45
14x+81=270/-81
14x=189/:14
x=13,5
3(b+5)=15
(folosim distributivitatea)
3b+15=15/-15
3b=0/:3
b=0
Succes!
