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f(4) = -6
-6 = 4p + q ... [ pers. 1 ]
f(-3) = 8
8 = -3p + q ... [ pers. 2 ]
4p + q = -6
-3p + q = 8 -
7p = -14
p = -2
4p + q = -6
-8 + q = -6
q = 2
f(-7) = -2(-7) + 2
f(-7) = 14 + 2
f(-7) = 16