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4x - 20 + 8 = 0
4x = 12
x = 3
(-5)(-1) + 2(y - 1) = 5
5 + 2y - 2 = 5
2y = 5 - 3
y = 2 ÷ 2 = 1
x . y = 3 . 1 = 3
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