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f(-2) = -2(-2) + 3 = 4 + 3 = 7
f(3) = -2(3) + 3 = -6 + 3 = -3
bagian b
f(a) = -2a + 3
-7 = -2a + 3
-2a = -7 - 3
-2a = -10
a = 5
f(-2) = -2(-2)+3 = 4+3 = 7
f(3) = -2(3)+3 = -6+3 = -3
B
-2a+3 = -7
-2a = -7-3
-2a = -10
a = -10:-2 = 5