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4x-5x-21x=-7+10+12
4x-26x=-7+22
-22x=15
22x=-15
X=-15/22
4 (x - 3) - 5 (x + 2) = 7 (3x - 1)
4x - 12 - 5x - 10 = 21x - 7
4x - 5x - 12 - 10 = 21x - 7
- x - 22 = 21x - 7
- x - 21x = - 7 + 22
- 22x = 15
x = 15/-22
x = - 15/22
Respuesta.
x = - 15/22