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3x = 18 - 6
3x = 12
x = 12 / 3
x = 4
2x + 5 = 15
2x = 15 - 5
2x = 10
x = 10 / 2
x = 5
2x + 3 = x + 8
2x - x = 8 - 3
x = 5
4x + 2 = 3x + 6
4x - 3x = 6 - 2
x = 4
que tengas buen día suerte :D
3x+6-18=0 2x+5-15=0 2x+3-x-8=0
3x -12=o 2x-10=0 x-5=0
3x=12 2x=-10 x=5
x=12/3 x=-10/2
x=4 x=-5