by transposition method 13(x-4)+9x-12/3=50
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,9-12 50
13(-4) +
3
13 52 9x - 12 = 50 x 3
13 9x - 52 - 12 = 150
22ac- 64 = 150
22a = 150 +64
22a 214
214
22
= 9.72
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