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To solve for y, we need to isolate the variable on one side of the equation.
First, we can simplify the right side of the equation by multiplying 7/10 by y:
43 = 15 + (7/10)y
43 - 15 = (7/10)y
28 = (7/10)y
To isolate y, we can multiply both sides of the equation by the reciprocal of 7/10, which is 10/7:
(10/7) * 28 = (10/7) * (7/10)y
40 = y
Therefore, the solution to the equation is y = 40.