Question 710594
{{{2/5 + c = 9/10 - c}}} :First transpose all c on one side
{{{ c+c = 9/10 -(2/5) }}} : Then simplify
{{{ 2c = 1/2 }}} : Then divide both sides by 2 to leave the c alone
{{{ (2c)/2 = (1/2)/2 }}}
c= 1/4