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5x-4x+3=7


just adding steps

5x-4x+3=7

you put numbers to getter but change sign

5x-4x=7-3

5x-4x=4

then it is clear

5(4)-4(4)=7

20-16=7


so as he said x=4

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Q: 5x - 4x plus 3 equals 7?
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