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3x-x=-5-3
2x=-8
X=-8/2
X=-4
3x + 5 - x + 3 = 0
(3x - x) + (5 + 3) = 0
(3 - 1)x + 8 = 0
2x + 8 = 0
2x = -8
x = -8/2
x = -4
Comprobemos
3(-4) + 5 = (-4) - 3
-12 + 5 = -7
-7 = -7
Por tanto x = -4 es solución de la ecuación lineal.