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9(2x - 6) - (x + 3) = 4x - 18
18x - 54 - x - 3 = 4x - 18
17x - 57 = 4x - 18
17x - 4x = - 18 + 57
13x = 39
x = 39/13
x = 3
Respuesta.
x = 3
18x-4x-x=-18+54+3
13x=39
x=39÷13
x=3