This equation does not equal a number, but it can be factorised.
x2-xy-20y2=(x-5y)(x+4y)
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only when x is equal to 2
it means that x should equal 10. x + x = 20. x = 10
2 x 7 x 7 is equal to 98.
-x + x = 0.
if x is equal to the square root of 81 then x is ±9 (plus or minus 9)