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2y = 12-3x
y = (12-3x)/2
y = f(x) = (12-3x)/2
15 = (12-3x)/2
30 = 12-3x
3x = 12-30
3x = -18
x = -6
semoga membantu :)
2y=12-3x
y=6-3/2x
f(x)=6-3/2.x
15=(12-3x)/2
30=12-3x
3x=-18
x=-6