Question

решите уравнение 4-7Х/15+1-Х/3=4-2Х+1/5

Answer 1

( 4 - 7X) + 5*(1 - X) = 15 * 4 - 3 * (2X + 1 )
4 - 7X + 5 - 5X =  60 - 6X - 3
- 12X + 9 = - 6X + 57 
-6X + 12X = 9 - 57
6X = - 48
X = ( - 8 )

Answer 2

1)

$dfrac{4-7x}{15}+dfrac{1-x}3=4-dfrac{2x+1}5~~~~Big|cdot 15\\big(4-7xbig)+5cdotbig(1-xbig)=15cdot 4-3cdot big(2x+1big)\4-7x+5-5x=60-6x-3\-7x-5x+6x=60-3-4-5\-6x=48\\x=dfrac {48}{-6};~~~~~boxed{boldsymbol x=-8}$

2)

$dfrac{10-y}6+dfrac{3y+8}3=dfrac{y+6}2~~~~Big|cdot 6\\big(10-ybig)+2cdotbig(3y+8big)=3cdot big(y+6big)\10-y+6y+16=3y+18\-y+6y-3y=18-10-16\2y=-8\\y=dfrac {-8}2;~~~~~boxed{boldsymbol y=-4}$