291-(5×А+11)=239 А=?
291 - ( 5 • A + 11 ) = 239 5A + 11 = 291 - 239 5A = 52 - 11 A = 41 : 5 A = 8,2
291-(5*А+11)=239 (291+11)-5*А=239 302-5*А= 239 5*А=302-239 5*А=63 А=63:5 А=12,6