Question

720:(90-х)+45=125 пж​

Answer 1

$720 : ( 90 - {x} ) + 45 = 125,\\720 : ( 90 - {x} ) = 125 - 45,\\720 : (90 - {x} ) = 80,\\90 - {x} = 720 : 80,\\90 - {x} = 9,\\{x} = 90-9\\{x} = 81$