Question 1091430
{{{ ( 2y - 7 ) -( -8y - 15 ) }}}
{{{ 2y - 7 -(-8y) -(-15) }}}
{{{ 2y - 7 + 8y + 15 }}}
{{{ 10y + 8 }}}
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check:
Suppose {{{ y = 5 }}}
{{{ ( 2*5 - 7 ) -( -8*5 - 15 ) }}}
{{{ ( 10 - 7 ) -( -40 - 15 ) }}}
{{{ 3 - ( -55 ) }}}
{{{ 3 + 55 = 58 }}}
and
{{{ 10y + 8 = 10*5 + 8 }}}
{{{ 50 + 8 = 58 }}}
OK