Math

7x - 4(x + 4) + 20 = 25

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7x - 4(x + 4) + 20 = 25

7x - 4(x) (-4)( + 4) + 20 = 25

7x - 4x -16 + 20 = 25

3x + 4 = 25

3x + 4-4 = 25-4

3x=21

3x/3=21/3

x=7