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6x - 2x = 8+14
4x = 22
x = 22/4
x = 5.5
2.- -3x+ 12 = 4x - 9
12 + 9 = 4x + 3x
21 = 7x
21/7 =x ó x = 22/7 (de las dos opciones es correcto el procedimiento)
x = 3
A) 6x-14=2x+8 ---> 6x - 2x = 8 + 14 ---> 4x = 22 ---> 4x/4 = 22/4 ---> [X = 22/4]
B) -3x+12=4x-9 ---> -3x -4x = -9 -12 ---> -7x = -21
---> -7x/-7 = -21/-7 ---> [X = 3]
☆Comprobación:
A) 6x-14=2x+8 ---> 6(22/4) - 14 = 2(22/4) + 8 --->
132/4 - 14 = 44/4 + 8 ---> 33 - 14 = 11 + 8 --->
19 = 19 ✔
B) -3x+12=4x-9 ---> -3(3) + 12 = 4(3) - 9 --->
-9 + 12 = 12 -9 ---> 3 = 3 ✔
☆Respuesta:
A) [X = 22/4]
B) [X = 3]