Question

$x - 2y = 3$
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Answer 1

Answer:

$x - 2y = 3 \\ 21 - 2 \times y = 3 \\ 21 - 2 \times 9 = 3 \\ 21 - 18 = 3 \\ 3 = 3 \\ lhs = rhs$

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Answer 2

$x - 2y = 3$

21-2×y=3

21-2×y=321-2×y=321-2×y=321-2×9=3

21-2×y=321-2×y=321-2×y=321-2×9=321-2×y=321-2×y=321-2×9=321-2×y=321-2×9=321-18=3