Решите уравнения:
1) 4-6(x+2)=3-5x
2) (5x+8)-(8x+14)=9
3) 2.7+3y=9(y-2.1)
4) 7x+3=3(2x-1)+x
5)1.8(1-2x)= 7.8-(3.6x+6)

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