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2x-2y=-10 /:2
3x+4y=48
x-y=-5
3x+4y=48
x=-5+y
3(-5+y)+4y=48
x=-5+y
-15+3y+4y=48
x=-5+y
7y=63 /:7
x=-5+y
y=9
x=-5+9
y=9
x=4