Question 739355
Call the numbers {{{ a }}} and {{{ b }}}
I'll pick {{{ a }}} to be the larger number
given:
(1) {{{ a = 9b - 6 }}} 
(2) {{{ a + b = 54 }}}
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(1) {{{ -a + 9b = 6 }}}
Now you can add the equations, solve for {{{ b }}},
then solve for {{{ a }}}