its 4x +7.....since the 7 doesn't have an x like the 4 you can't add them together..:D
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4x + 7 = 6x -7 14=2x so x = 7 (plus a negative # is simply - that number)
If 4x + 7 = 3... then x must equal -1
4x - 7 = 5 + 7x x = -4
x+5+3x-7+9x+3-4x Collect like terms: 9x+1
It is a mathematical equation, usually written like this: 5x - 7 + 2x = 3x - 2 + 4x