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6x + 9y = 33 -
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-5y = -15
y = 3
3x + 2y = 9
3x + 6 = 9
3x = 3
x = 1
x+y = 4
9-(2×2)=5
5:5=1
x=1, y=1+2=3
x+y=1+3=4