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13x-1=-4+15x
4-1=15x-13x
3=2x
3/2=x
3x+5(2x-1) = 8 - 3(4-5x)
3x + ( 10x -5 ) = 8 -(12 - 15x)
3x + 10x -5 = 8 -12 +15x
-5-8+12 = 15x -10x -3x
-13 + 12 = 15x - 13x
-1= 2x
x= -1/2
Reemplazando x= -1/2 en la ecuación para comprobar:
3x+5(2x-1) = 8 - 3(4-5x)
3(-1/2) + 5 (2 *-1/2 -1) = 8 - 3( 4 - 5* -1/2)
-3/2 + 5(-1-1) = 8 - 3( 4 + 5/2)
-3/2 + 5(-2) = 8 -3 ((8 +5))/2
-3/2 -10 = 8 -3 (13/2)
-3 8 - 39
--- - 10 = ---------
2 2
-3 - -20 16 - 39
----------- = -------------
2 2
-23 = -23
--------- -------- por lo tanto queda demostrado.
2 2