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
4x - 4y + 7 = 15to get it into y-intercept form do this...4x -4x - 4y + 7 - 7 = 15 - 7 - 4x-4y = 8 - 4x-4y / -4 = (8 / -4) + (-4x / -4)y = x + 2you did not give any values to plug in so this is as best an answer i can give