Question 982931
Let {{{ a }}} = number of pens Anna has
Let {{{ r }}} = number of pens Raj has
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(1) {{{ a = r - 3 }}}
(2) {{{ r + 2 = 2a }}}
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Substitute (1) into (2) 
(2) {{{ r + 2 = 2*( r-3 ) }}}
(2) {{{ r + 2 = 2r - 6 }}}
(2) {{{ r = 8 }}}
and
(1) {{{ a = r - 3 }}}
(1) {{{ a = 8 - 3 }}}
(1) {{{ a = 5 }}}
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Together they have:
{{{ a + r = 5 + 8 = 13 }}}
13 pens