(2x+1)/3 -(x-2y)/5=4(2x+y)/15 5(2x+1) -3(x-2y)=4(2x+y)
(x-4y)/3 +(5x-11y)/6=(3x-1)/4 ⇔ 4(x-4y) +2(5x-11y)=3(3x-1) ⇔
10x+5-3x+6y=8x+4y -x +2y =-5 ⇒ x=2y+5
4x-16y +10x-22y=9x-3 5x-38y=-3 5·(2y+5 )-38y=-3 -28y=-28 y=1
x=2·1+5=7
x=7
y=1
проверка
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(2·7+1)/3 -(7-2·1)/5=4·(2·7+1)/15 15/3-5/ 5= 4( 15/15) 4=4 верно
(7-4·1)/3 +(5·7-11·1)/6=(3·7-1)/4 3/3 +(24/6) =20/4 1+4=5 верно
(7x+y)/3 -(5x-y)/2=(x+y)/6 2·(7x+y) -3·(5x-y)=(x+y)
(9x-2y)/8 +(7x+4y)/6=(x+y)/3 +4 ⇔ 3· (9x-2y) +4·(7x+4y)=8·(x+y) +4·24
14x+2y-15x+3y=x+y -2x=-4y x=2y
27x-6y+28x+16y=8x+8y+96 47x+2y=96 47·2y+2y=96 96·y=96 y=1
x=2
проверка
(7·2+1)/3 -(5·2-1)/2=(2+1)/6 5-9/2 =1/2 верно
(9·2-2·1)/8 +(7·2+4·1)/6=(2+1)/3 +4 ⇔ 16/8 +18/6 =1+4 2+3=5 верно