Question 577627
(1) {{{ s = 3p - 2 }}}
Subtract {{{ 3p }}} from both sides
(1) {{{ s - 3p = -2 }}}
and
(2) {{{s = 2p + 1 }}}
Subtract {{{ 2p }}} from both sides
(2) {{{ s - 2p = 1 }}}
Subtract (2) from (1)
(1) {{{ s - 3p = -2 }}}
(2) {{{ -s + 2p = -1 }}}
{{{ -p = -3 }}}
{{{ p = 3 }}}
and, since
(2) {{{s = 2p + 1 }}}
(2) {{{ s = 2*3 + 1 }}}
(2) {{{ s = 6 + 1 }}}
(2) {{{ s = 7 }}}