Question 1013322
Opposite angles of a parallelogram 
are equal, so
{{{ 5x - 26 = 4x + 4 }}}
{{{ x = 30 }}}
The opposite angles are:
{{{ 5x - 26 = 5*30 - 26 }}}
{{{ 5x - 26 = 124 }}}
and
{{{ 4x + 4 = 4*30 + 4 }}}
{{{ 4x + 4 = 120 + 4 }}}
{{{ 4x + 4 = 124 }}}
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Let {{{ y }}} = one of the other opposite
pairs of angles. Since the angles of a 
parallelogram add up to {{{ 360 }}} degrees,
{{{ 124 + 124 + 2y = 360 }}}
{{{ 2y = 360 - 248 }}}
{{{ 2y = 112 }}}
{{{ y = 56 }}}
The angles are 56, 56, 124, and 124
check:
{{{ 2*56 + 2*124 = 360 }}}
{{{ 112 + 248 = 360 }}}
{{{ 360 = 360 }}}
OK