3x+5=20, x=5, x=-5, 2x-7=11, x=-22, x=9, 5x+3=28, x=5, 10, 9x-4=50, x=-6, x=6, 6x-12=18, x=5, x=-7, 3x+9=30, x=7, x=-14, 8x-4=28, x=2, x=4, 9x+6=51, x=-10, x=5, 5x-15=10, x=5, x=-25, 12x-27=45+9x, x=24, x=43, x + y=10 , x - y=4, x=7 y=3, x=14 y=9, x=-7 y=14, x=-14 y=-9, 2x= y=8 , x = y =5, x=-4 y=2, x=2 y=-4, x=3 y=2, x=8 y=16, 3x = y = 13 , x + y =7, x=3 y=4, x=9 y=8.

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