Question

решите уравнение 2(х+15)=5х + 15

Answer 1

2х+30=5х+15

2х-5х=-30+15

-3х=-15

х=5

ответ:5

Answer 2

$2(x + 15) = 5x + 15 \\ 2x + 30 = 5x + 15 \\ 2x - 5x = 15 - 30 \\ - 3x = - 15 \\ - x = - 15 \div 3 \\ - x = - 5 \\ x = 5$