Помогите решить уравнения плиз!!! 1)9x+(7x+5)-(2x-3)=x+47
2)3x-(8+9x)-(5x-4)=-7x
3)x-15.5+8x-(13x+16.5)=12x
4)6x-(2x+13)-(x-7)=15x
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