Question

100-((8×x-20×11):5+84:4)×7=175

Answer 1

100-((8•x-20•11):5+21)•7=175
100-
$( \frac{8x - 220}{5} + 21) \times 7 = 175$
$100 - \frac{7(8x - 220}{5} + 147) = 175$
$100( \frac{56x - 1540}{5} + 147) = 175$
$100 - \frac{56x - 1540}{5} - 147 = 175$
$- 47 - \frac{56x - 1540}{5} = 175$
$- 235 - (56x - 1540) = 875$
$- 235 - 56x + 1540 = 875$
$1305 - 56x = 875$
$- 56x = 875 - 1305$
$- 56x = - 430$
$x \frac{215}{28}$