Помогите решить такие уравнения с X 1) 10 ( 2x - 7 ) - 5 ( 4x - 2 ) = - 60
2) 3 ( 5x - 4 ) - ( 15x - 2 ) =9
это дроби:
3x + 1 2x + 1
3) ---------- + ---------- = 2
7 5
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