Question

Calculati:

0,7x-(1,5x-0,7x+0,2x)+1,3x

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Answer 1

0,7x-(0,8x+0,2x)+1,3x
0,7x-1x+1,3x
-0,3x+1,3x
1x

Answer 2

$\it 0,7x - (1,5x - 0,7x + 0,2x) + 1,3x = \\ \\ \it \frac{7}{10} x - ( \frac{15}{10} x - \frac{7}{10} x + \frac{2}{10} x) + \frac{13}{10} x = \\ \\ \it \frac{7}{10}x - ( \frac{8}{10} + \frac{2}{10} x) + \frac{13}{10} x = \\ \\ \it \frac{7}{10} x - \frac{10}{10} x + \frac{13}{10} x = \\ \\ \it - \frac{3}{10} x + \frac{13}{10} x = \frac{10}{10}x = \boxed{x}$