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21 4x x 2 0
21 4x x 2 0 pictures 5
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21 4x x 2 0
x 2 4x 21 0 quadratic equation
x 2 4x 21 0 solutions
roots of x 2 4x 21 0
x 2 4x 21 0 discriminant
x 4 4x 2 21 0
factorise x 2 4x 21 0
factor x 2 4x 21 0
x 2 4x 21 0 quadratic formula
21 4x x 2 0 kuadrat sempurna
21 4x x 2 0
