X plus 9 is equal to 3 times x minus 4

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X plus 9 is equal to 3 times x minus 4

x plus 9:
x + 9

3 times x minus 4:
3x - 4

The phrase is equal to means an equation, so we set x + 9 equal to 3x - 4:
x + 9 = 3x - 4