Question

Rezolvati in R ecuatia: a) 5(3x-6)+4(3-2x) = 5x -8.
B) 9(x-3)-4(7-3x)= 5-3x
D) 15-x pe 6 - 2x+16 pe 5 = 1

Answer 1

a) 5(3x-6)+4(3-2x) egal 5x-8⇔15x-30+12-8x egal 5x-8⇔2x egal 10⇔x egal 5
b) 9(x-3)-4(7-3x) egal5-3x ⇔9x-27-28+12x egal 5-3x ⇔24x egal 60 ⇔x egal 2,5
d) (15-x)/6-(2x+16)/5 egal 1⇔(75-5x-12x+96)/30 egal 1 (am adus la numitorul comun) ⇔-17x/30 egal -141/30 ⇔ -17x : 30 egal -141/30 ⇔-17x egal  -141⇔x egal 141/17