C. 19 / 19
ExplanationStep 1: Derivative of a linear expression equals the coefficient of x. Step 2: Derivative of 19x is 19 and derivative of -7 is 0. Step 3: Derivative of a constant is zero.
Step 1: Linear expression का derivative x के coefficient के बराबर होता है। Step 2: 19x का derivative 19 और -7 का derivative 0 है। Step 3: Constant का derivative zero होता है।
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