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15x -10 = 6x -( x +2 ) + ( - x +3)
15x -10 = 6x - x - 2 - x +3
15x -10 = 4x +1
15x -4x = 1 +10
11x = 11
x = 11/11
x = 1
comprobacion
15*1 -10 = 6*1 -( 1+2) +(-1+3)
15-10 = 6 -3 +2
5 = 5