a)\(\left(4x+1\right)\left(x-3\right)-\left(x-7\right)\left(4x-1\right)=15\)
\(4x^2-11x-3-\left(4x^2-29x+7\right)=15\)
\(4x^2-11x-3-4x^2+29x-7=15\)
\(18x-10=15\)
\(x=\frac{25}{18}\)
b)\(\left(3x-5\right)\left(x+1\right)-\left(3x-1\right)\left(x+1\right)=x-4\)
\(\left(x+1\right)\left(3x-5-3x+1\right)=x-4\)
\(\left(x+1\right).\left(-4\right)-x+4=0\)
\(-4x-4-x+4=0\)
\(x=0\)
a) \(\left(4x+1\right)\left(x-3\right)-\left(x-7\right)\left(4x+1\right)=15\)
\(\left(4x+1\right)\left(x-3-x+7\right)=15\)
\(\left(4x+1\right)4=15\)
\(4x+1=15:4\)
\(4x+1=3,75\)
\(x=\frac{11}{16}\)
b) \(\left(3x-5\right)\left(x+1\right)-\left(3x-1\right)\left(x+1\right)=x-4\)
\(\left(x+1\right)\left(3x-5-3x+1\right)=x-4\)
\(\left(x+1\right).-4=x-4\)
\(-4x-4-x+4=0\)
\(-5x=0\)
\(x=0\)
k nhé