Sooos 1144 и 1146 задание

Question

Sooos 1144 и 1146 задание

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Answer 1

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Answer 2

1144
1) 3x+x=28
4x=28
x=28/7
x=7

2)5x-8x=30-12
-3x=18
x=18/(-3)
x=-6 

3)8x+5x=72-33
13x=39
x=39/13
x=3