Buenas tardes : 3x - 2(x + 3) = x - 3(x + 1) ejercico(a) : 3x - 2x - 6 = x - 3x - 3 : 3x - 2x - x + 3x = - 3 + 6 : 3x = 3 : x = 3 / 3 = 1 : x = 1
comprobacion : 3(1) - 2(1 + 3 = 1 - 3(1 + 1) : 3 - 2 - 6 = 1 - 3 - 3 : - 5 = - 5
ejercicio(b) 4 + x - 4(1 - x) + 5(2 + x) = 0 4 + x - 4 + 4x + 10 + 5x = 0 x + 4x + 5x = 0 + 4 - 10 10x = - 6 x = - 6 / 10 simplifico entre 2 y obtengo : x = - 3 / 5
comprobacion : 4 + ( - 3 / 5) - 4(1 - ( - 3 / 5)) + 5(2 + ( - 3 / 5)) = 0 : 4 + ( - 3 / 5) - 4 + 4( - 3 / 5)10 + 5( - 3 / 5) = 0 : - 3 / 5 + 4( - 3 / 5) + 5( - 3 / 5) = 0 + 4 - 10 : 10( - 3 / 5) = - 6 : - 3 / 5 = - 6 / 10 = - 3 / 5 : - 3 / 5 = - 3 / 5
ejercicio(c) 2x + 7 - 2(x - 1) = 3(x + 3) 2x + 7 - 2x + 2 = 3x + 9 2x - 2x - 3x = 9 - 7 - 2 - 3x = 0 x = 0 / 3 x = 0
comprobacion : 2(0) + 7 - 2(0 - 1) = 3(0 + 3) : 0 + 7 - 0 + 2 = 0 + 9 : 7 + 2 = 9 : 9 = 9
ejercicio(d) 4(2x - 7) - 3(3x + 1) = 2 - (7x) 8x - 28 - 9x - 3 = - 14x 8x - 9x + 14x = 3 + 28 11x = 31 x = 31 / 11
comprobacion : 4(2(31 / 11 - 7)) - 3(3(31 / 11 + 1)) = 2 - (7(31 / 11)) : 8(31 / 11) - 28 - 9(31 / 11) - 3 = - 14(31 / 11) : 8(31 / 11) - 9(31 / 11)14(31 / 11) = 3 + 28 : 11(31 / 11) = 31 : 31 / 11 = 31 / 11
espero haberte ayudado.