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2x = 5 - 2y
x = 5/2 - y
4x - 3y = -18
4(5/2-y) - 3y = -18
10 - 3y = -18
3y = 10 + 18
3y = 28
y = 9,33333333
x = 5/2 - y
x = 5/2 - 9,33333
x = -6,83333333
#maaf kalo salah