20 △ 5x = 80 solution x =?

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• 2. Solution equation: X / (x + 1) = 2x / 3 (x + 1) + 1
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• 4. To solve the equation, the detailed process is needed; 1 / 2x-7 = (9x-2) / 6
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• 12. 3×+7.4=20 6.4×+3.6×=51
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• 15. Junior high school mathematics 5x + 1 / 6 = 7 / 2 3-x / 2 = x-4 / 3 x + 2 / 4-3-x / 8 = 0 X / 2-x-1 / 3 = 1 2x1 / 2 = x + 3 / 4-2-3x / 8 x-10x + 1 / 12 = 2x + 1 / 4-1 if there are good ones, I will offer more rewards
• 16. 5x+4/3+x-1/4=2-5x+5/12
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• 18. 5x=80 5x÷x=80÷x 5=?
• 19. Complete set u = {1,2,3,4}, a = {X / X × x-5x + P = 0}, CUA = {x × x-qx + 6 = 0}, find the value of P, q?
• 20. Given that the value of polynomial 5x & # 178; - 6x + 10 is 5, then what is the value of 5x-3 of 6