If you mean: 20 -3x = 14 then the value of x is 2
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5x - 4y ≥ -203x - 2y ≤ -8y ≥ -3
3x + 5 = -20. First, subtract 5 from both sides of the equation: 3x + 5 - 5 = -20 - 5; and simplify: 3x = -25. Then divide both sides by 3: 3x / 3 = -25 / 3; and simplify: x = -8 1/3 (or -8.33)