Question

Cuánto es?
7b-8=5b+4

Answer 1

Explicación paso a paso:

$7b - 8 = 5b + 4 \\ 7b - 5b = 4 + 8 \\ 2b = 12 \\ b = 12 \div 2 \\ b = 6 \\ \\ comprobamos \\ 7 \times 6 - 8 = 5 \times 6 + 4 \\ 42 - 8 = 30 + 4 \\ 34 = 34$