Your question is actually: "What is 'x' if [18 = 3 + 5x] ?"
18 = 3 + 5x
Subtract 3 from each side of the equation:
15 = 5x
Divide each side by 5:
3 = x
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5x+18 = 2x+9 5x-2x = 9-18 3x = -9 x = -3 and y = 3
No.
10x - 18 = 5x + 2 Add -5x + 18 to both sides of the equation, to get: 5x = 20, from which x = 4.
5x - 18 = 4x + 7Add 18 to each side:5x = 4x + 25Subtract 4x from each side:x = 25
That equation has no solution. There is no possible number that's equal to 18 more than itself.