x=15 - x-5=10, x=5 - x+5=10, x=10 - x-5=5, x=0 - x+5=5, x=2 - 10x+10=30, x=23 - x-8=15, x=20 - 3x=60, x=30 - 3x=90, x=7 - x2=49, x=3 - 2x=6,

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