5 (y-4) - 7 (7-y) = 12-3 (9-y) [15 - (7 / 9 + 5 / 6-1 / 3-11 / 18) × 18] / (- 6 / 5) | Math enthusiast | Mathematical art

5 (y-4) - 7 (7-y) = 12-3 (9-y) [15 - (7 / 9 + 5 / 6-1 / 3-11 / 18) × 18] / (- 6 / 5)

5(y-4)-7(7-y)=12-3(9-y)
5y-20-49+7y=12-27+3y
12y-3y=12-27+20+49
9y=54
y=6
[15 - (7 / 9 + 5 / 6-1 / 3-11 / 18) × 18] / (- 6 / 5)
={15 - (14 + 15-6-11)} × - 5 / 6
={15-14-15 + 6 + 11} × - 5 / 6
=3 × - 5 / 6
=-5 / 2

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