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Make d the subject of the formula: 3d + dxy = 4
d (3 + xy) = 4
d = 4/(3 + xy)
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How do you find the mean of 5 values?
Solve the simultaneous equations: x^2 + y^2 = 25 and y − 2x = 5
[equ1] 3y − 6x = 3 [equ2] y y x 2 − x + 2 2 = 2
Solve algebraically: 6a + b = 16 5a - 2b = 19
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