We can start by multiplying the numerators and denominators separately:
(2x - 2) / 21 * 49 / (1 - x)
= [(2(x - 1)) / 21] * [49 / -(x - 1)]
Notice that (1 - x) = -(x - 1), so we can simplify the expression further:
= [(2(x - 1)) / 21] * [49 / -(x - 1)]
= [(2(x - 1)) / 21] * [49 / (x - 1)]
= [2 * 7] / [3 * (x - 1)]
= 14 / (3x - 3)
Therefore, the simplified expression is 14 / (3x - 3).