Solutia reala a ecuatiei -2x+7= 5-4x este...

Răspuns :

- 2X + 7 = 5 - 4X
4X - 2X = 5 -7
2X = - 2
X = -2/2
X = - 1

V. -2×( -1)+7 = 5-4×(-1)
2+7 = 5+4
9 = 9