Line k is defined by the equation y = 4x − b. If the x-intercept of line k is 3, what is b?

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Line <em>k</em> is defined by the equation <em>y</em> = 4<em>x</em> − <em>b</em>. If the <em>x</em>-intercept of line <em>k</em> is 3, what is <em>b</em>?