Question

Решите уравнение а)2x-5=4x-15 б)3(5+2x)-7=9x-4

Answer 1

а)2х-4х=-15+5
-2х=-10
х=(-10):(-2)
х=5
ответ.
б)15+6х-7=9х-4
6х-9х=-4-8
-3х=-12
х=-12:(-3)
х=4

Answer 2

а)

$2x - 5 = 4x - 15 \\ 15 - 5 = 4x - 2x \\ 2x = 10 \\ x = 10 \div 2 \\ x = 5$
б)

$3(5 + 2x) - 7 = 9x - 4 \\ 15 + 6x - 7 = 9x - 4 \\ 8 + 4 = 9x - 6x \\ 3x = 12 \\ x = 12 \div 3 \\ x = 4$