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10x = -10x -20
10x + 10x = -20
20x=-20
x= -1
Si sustituyes el valor de x en la ecuacion que estas preguntando, veras que de los dos lados te da -10.
15x + (-6x+5) - 2 - (-x+3) = - (7x+23) - x + (3-2x)
15X - 2 + X - 3 + -6X + 5 = -7X - 23 - X + (-2X + 3)
10X + 0 = -8X - 23 + -2X + 3
10X = -10X - 20
20X = -20
X = -1
¡Suerte!