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7x-5+2x=3-4x+12

7x+2x-5=3+12-4x

9x-5=15-4x

9x+4x-5=15-4x+4x

13x-5=15

13x-5+5=15+5

13x=20

13x/13=20/13

x=20/13

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15y ago

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