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Solution:
Given: Equation is 7x + 2y = 48
When y = 3
7x + 2 (3) = 48
By further calculation,
7x + 6 = 48
So we get,
7x = 48 - 6
On subtraction,
7x = 42
Divide both sides by 7 using the division property of equality
7x/7 = 42/7
x = 6
Therefore, the value of x is 6.
Summary:
The value of x in the equation 7x + 2y = 48 , when y = 3 is 6.