300-7[4(3+5)]3•3 does the bracket mean you divide I can’t remember I know you would use pemdas

you can't solve x because it is 2 linear equation and you only have one equation

only 2 solutions are positive

also the part with what number should be added to both sides of the equation

should be 2 or 4

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).