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-49+105x=135
56x=135
7(3x - 10x) = 15(9 - 7x)
7(- 7x) = 135 - 105x
- 49x = 135 - 105x
- 49x + 105x = 135
56x = 135
x = 135/56
Respuesta,
x = 135/56