Explicación paso a paso:
3x + 5 = 4 x - 7
+5 - 4 + 7 = x - 3 x
- 1 + 7 = - 3 x
3 + 6 = - x
+ 9 = - x
x = +9
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Explicación paso a paso:
3x + 5 = 4 x - 7
+5 - 4 + 7 = x - 3 x
- 1 + 7 = - 3 x
3 + 6 = - x
+ 9 = - x
x = +9