Розв'яжіть рiвняння: а) 8x - 8 = 20 - 6x; б) x + 16 = x + 9; в) 2,7 + 3y = 9(y – 2,1). г) 11,5х – 8,7 = 1,5х + 5,9. д) 5(2 - 3x) + 3(7 + 2x) = 25.​
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