Решите уравнения 1) 8,4-(x-3,6)=18
2)9,3+(3,1-y)=12,2
3)7,7-(3,8+x)=-1,1
4)3(0,4x+7)-4(0,8x-3)
5)0,4x+0,3x-0,84x=1,12
помогите пожалуйста решить
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