Philip P. answered 01/06/15
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x + 4 = y - 6
To solve for y, add 6 to both sides of the equation:
x + 4 + 6 = y - 6 + 6
x + 10 = y
To solve for x, subtract 4 from both sides of the equation:
x + 4 - 4 = y - 6 - 4
x = y - 10