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To solve for y, we need to isolate it. Start by moving all of the values on the side the y is on that don't have y to the other side (kind of confusing the way I said it). By that, I mean subtract 3x from both sides:W = 3x + 7yW - 3x = 7yNow, divide both sides by 7 to find the value of y:W - 3x = 7y(W - 3x)/7 = yHope this helps! :)...