2x - 6x + 8y + y = x(2 - 6) + y(8 + 1) = x(-4) + y(9) = -4x + 9y.
Sederhananya adalah -4x + 9y
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2x - 6x + 8y + y = x(2 - 6) + y(8 + 1) = x(-4) + y(9) = -4x + 9y.
Sederhananya adalah -4x + 9y