{(x+7)/3-(y-8)/5=3|*15
{(x+5)/4+(y+9)/3=5|*12
{5x+35-3y+24=45
{3x+15+4y+36=60
{5x-3y=45-59
{3x+4y=60-51
{5x-3y=-14|*4
{3x+4y=9|*3
+{20x-12y=-56
+{9x+12y=27
29x=-29|:29
x=-1
-1*3+4y=9
4y=9+3
4y=12|:4
y=3
{(x+9)/3-(y+8)/6=3|*6
{(x+11)/7+(y+6)/2=4|*14
{2x+18-y-8=18
{2x+22+7y+42=56
{2x-y=18-10
{2x+7y=56-64
-{2x-y=8
-{2x+7y=-8
-8y=16|:(-8)
y=-2
2x-(-2)=8
2x=8-2
2x=6|:2
x=3