Question

Rezolvati in multimea numerelor rationale ecuatiile:
d) 14× + 7=20× - 17
e) 5× + 17=13× - 15
f) 15× + 12=11× + 9
c) 10× - 41=3× -27

Answer 1

[tex]d) 10x+7=20x-17\\ 10x-20x=-17-7\\ -10x=-24\\x= \frac{-24}{-10}\\x= \frac{12}{5}=2,4 \\ e) 5x+17=13x-15\\ 17+15=13x-5x\\ 8x=32\\ x=32:8\\x=4\\ f) 15x+12=11x+9\\ 15x-11x=9-12\\ 4x=-3\\x= -\frac{3}{4}\\ c) 10x-41=3x-27\\ 10x-3x=-27+41\\ 7x=14\\ x=14:7\\x=2 [/tex]