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(-2) = 10 → -2a + b = 10 -
5a = 5
a = 5/5
a = 1
3a + b = 15
3(1) + b = 15
3 + b = 15
b = 15 - 3
b = 12
rumus fungsi → f(x) = x + 12
f(7) = x + 12
= 7 + 12
= 19