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------ - x = ----- - -----
19 7 4
9-19x 12-7
-------- = -------
19 28
9-19x 5
-------- = -----
19 28
Multiplicamos en aspa
28(9-19x)=19×5
252-532x=95
252-95=532x
157=532x
157/532=x
Rpta: x=157/532
9/19 - X = (12 - 7) / 28 común denominador
9/19 - X = 5 / 28
- X = 5/28 - 9/19
- X = (95 - 252) / 532 común denominador
- X = - 157 / 532
X = 157 / 532
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