Question 1151698
Let {{{ a }}} = total revenue
Let {{{ b }}} = expenses
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(1) {{{ b = (2/7)*a }}}
(2) {{{ a - b = 99700 }}}
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Plug (1) into (2)
(2) {{{ a - (2/7)*a = 99700 }}}
(2) {{{ (5/7)*a = 99700 }}}
(2) {{{ 5a = 69790 }}}
(2) {{{ a = 139580 }}}
The total revenue was $139,580 
check:
(1) {{{ b = (2/7)*a }}}
(1) {{{ b = (2/7)*139580 }}}
(1) {{{ b = 39880 }}}
and
(2) {{{ a - b = 99700 }}}
(2) {{{ 139580 - 39880 = 99700 }}}
(2) {{{ 99700 = 99700 }}}
OK