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(2×x+5):5+4=1 va rog ajutatima!

Răspuns :

(2*x+5):5=1-4
(2*x+5)+5=-3
(2*x+5)+5=-15
2x+5=-15-5
2x=-20
x=-10
(2×x+5):5+4=1
(2×x+5):5=1-4
(2×x+5):5=-3
2×x+5=-3×5
2×x+5=-15
2×x=-15-5
2×x=-20
x=-20:2
x=-10

Succes!!