If: x+(-5) = 4
Then: x = 9
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x=5
4, -5
If your expression is 5x + 4 = ? and x = 3, then the answer is 19. If the expression is 5(x + 4) = ? and x = 3, then the answer is 35.
9 plus 7 equals 144. Generally, x plus y = x(x+y).
30 - 12 = 18