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(4*x+3*x)'The calculation above is a derivative of the function f (x)
(4*x)'+(3*x)'
4*(x)'+(3*x)'+(4)'*x
4*(x)'+(3*x)'+0*x
(3*x)'+0*x+4*1
3*(x)'+(3)'*x+4
3*(x)'+0*x+4
0*x+3*1+4
7
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