Without an equality sign the information given does not qualify it to be an equation
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you have to solve for it. it will be different for every equation. lets say your equation is... y=3x-12 when you y-coordinate is zero you have this... 0=3x-12 now solve for x 0=3x-12 12=3x x=4 therefore your coordinates would be (4,0)
1 + 3x - x = x - 4 + 2x 1 + 4 = x + 2x - 3x + x 5 = x
The answer is dividing. 3x=24 3x/3=24/3 x = 8
X = 12
Simple algebra. 1 + 3x = -x - 4 3x = -x - 5 -3x = x + 5 -4x = 5 x = -1.25