Question

17x-50=7× outra 12x -21=10×+16

Answer 1

$17x - 50 = 7x \\ 17 - 7 \times = 50 \\ 10 \times = 50 \\ \times = 50 \div 10 \\ \times = 5$
$12x - 21 = 10x + 16 \\ 12 - 10 \times = 16 + 21 \\ 2 \times = 37 \\ \times = \frac{37}{2} \: ou \: \times = 18.5$