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4x-2y=3m+1
2x+2y=9m-7
4x-(x+8)=3m+1
2x+x+8=9m-7
4x-x-8=3m+1
3x+8=9m-7
3x-9=3m
3x+15=9m
9m=9x-27
9m=3x+15
9x-27=3x+15
6x=42
x=7
2y=x+8
2y=15
y=7,5
4x-2y=3m+1
4*7-2*7,5=3m+1
28-15=3m+1
13=3m+1
3m=12
m=4