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Ligninger med parenteser

Når en ligning som -9 - (9x - 6) = 3(4x + 6) har parenteser, så kan vi gange ind i dem uden at ændre værdien af hver side. Dernæst samles ens led og vi flytter alle x-led over på den ene side og alle konstanter over på den anden og løser for x. Lavet af Sal Khan og Montereys Institut for teknologi og undervisning.

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