7/9x = 10
7x/9 = 10
9 * 7x/9 *10
7x = 9*10
7x = 90
x = 90/7
comprobemos
7/9 ( 90/7 ) = 10
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7/9x = 10
7x/9 = 10
9 * 7x/9 *10
7x = 9*10
7x = 90
x = 90/7
comprobemos
7/9 ( 90/7 ) = 10
x = 90/7