\(d) 2x\cdot\left(5x+1\right)-\left(2x-5\right)\left(7x+2\right)=3-\left(2x-3\right)\left(2x+7\right)\) \(\Leftrightarrow10x^2+2x-(14x^2+4x-35x-10)=3-(4x^2+14x-6x-21)\) \(\Leftrightarrow10x^2+2x-14x^2+31x+10=3-4x^2-8x+21\) \(\Leftrightarrow-4x^2+33x+10=-4x^2-8x+24\)
\(\Leftrightarrow33x+10=-8x+24\)
\(\Leftrightarrow41x=14\Leftrightarrow x=\dfrac{14}{41}\)
\(2x\left(5x+1\right)-\left(2x-5\right)\left(7x+2\right)=3-\left(2x-3\right)\left(2x+7\right)\)
\(\Leftrightarrow10x^2+2x-\left(14x^2+4x-35x-10\right)=3-\left(4x^2+14x-6x-21\right)\)
\(\Leftrightarrow10x^2+2x-14x^2+31x+10=3-4x^2-8x+21\)
\(\Leftrightarrow-4x^2+33x+10=3-4x^2-7x+21\)
\(\Leftrightarrow-4x^2+4x^2+33x+7x=3+21-10\)
\(\Leftrightarrow40x=14\)
\(\Leftrightarrow x=\dfrac{14}{40}\)
\(\Leftrightarrow x=\dfrac{7}{20}\)
