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4x - 7y = 12

-7y = -4x + 12

y = (4/7)x - (12/7)

======================

4x - 7y = 12

4x = 7y + 12

x = (7/4)x + 3

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Q: Solve the equation 4x-7y equals 12 for y in terms of x then solve it for x in terms of y?
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