Question

Дам 25 баллов помогите

Answer 1

Ответ:

-7(0,3х-8)+3(0,4х+5)=8

-2,1х+56+1,2х+15=8

-0,9х+71=8

-0,9х=8-71

-0,9х=-63

х=-63÷(-0,9)

х=70

Answer 2

Ответ:

$- 7(0.3x - 8) + 3(0.4x + 5) = 8 \\ - 2.1x + 56 + 1.2x + 15 = 8 \\ - 2.1x + 1.2x = 8 - 56 - 15 \\ - 0.9x = - 63 \\ x = - 63 \div ( - 0.9) \\ x = 630 \div 9 \\ x = 70$