If x=4... then 'y' MUST equal 3 !
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2xy=2*30*2=120
15xy-2xy-7x+x=13xy-6x
2xy - 4x plus 8y - 16 equals x plus 4 in parentheses multiplied by 2y minus 4 in parentheses. So, the factors are ( x + 4) and ( 2y - 4) .
4xy - 2y(x + 4) = 4xy - 2xy - 8y = 2xy - 8y = 2y(x - 4)
5 x 4 equals 4 x 5 is commutative property.