N N 2. Яке з рiвнянь є рівносильним даному 5х + 7 = 17 - 9x: a) 5x - 9x = 17 +7; б) 5x + 9x = 17 + 7; в) 5х - 9x = 17 - 7; г) 5х + 9x = 17 - 7?​
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