\(a,x\cdot(5-2x)+2x\cdot(x-1)=15\\\Rightarrow 5x-2x^2+2x^2-2x=15\\\Rightarrow (5x-2x)+(-2x^2+2x^2)=15\\\Rightarrow 3x=15\\\Rightarrow x=15:3=5\\---\)
\(b,5x-3\cdot\left\{4x-2\cdot\left[4x-3\cdot\left(5x-2\right)\right]\right\}=182\)
\(\Rightarrow5x-3\cdot\left\{4x-2\cdot\left[4x-15x+6\right]\right\}=182\)
\(\Rightarrow5x-3\cdot\left\{4x-2\cdot\left[-11x+6\right]\right\}=182\)
\(\Rightarrow5x-3\cdot\left\{4x+22x-12\right\}=182\)
\(\Rightarrow5x-3\cdot\left\{26x-12\right\}=182\)
\(\Rightarrow5x-78x+36=182\)
\(\Rightarrow-73x=182-36\)
\(\Rightarrow-73x=146\)
\(\Rightarrow x=146:(-73)=-2\)
\(---\)
\(c,2x(x-5)-x(3+2x)=26\\\Rightarrow 2x^2-10x-3x-2x^2=26\\\Rightarrow (2x^2-2x^2)+(-10x-3x)=26\\\Rightarrow -13x=26\\\Rightarrow x=26:(-13)=-2\\---\)
\(d,2\cdot(5x-8)-3\cdot(4x-5)=4\cdot(3x-4)+11\\\Rightarrow 10x-16-12x+15=12x-16+11\\\Rightarrow 10x-12x-12x=-16+11+16-15\\\Rightarrow 10x-24x=(-16+16)+(11-15)\\\Rightarrow -14x=-4\\\Rightarrow x=-4:(-14)=\dfrac{2}{7}\)
#\(Toru\)
