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22-05-2017
Mathematics

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Аноним Аноним

22-05-2017

6)
80+160+100+8x+8+5x+10=540
13x + 358 = 540
13x = 540 -358
13x = 182
x = 182/13
x = 14
answer x =14

7)
7x+13=8x-8
8x-7x=13+8
x = 21
answer x = 21

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