5x-7 is an algebraic expression
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If you mean: 5x/7 -6 = x then x = -21
5m + 7 - 2m - 1 = 3m + 6
5x² - 18x + 9 = (5x² - 15x) - (3x - 9) = 5x(x - 3) - 3(x - 3) = (5x - 3)(x - 3).
X= 2!
-6x+3 = -7-5x 7+3 = 6x-5x 10=x