$\large 0,8+x=5,5\times 4$
$\large 0,8+x=7,7$
$\large x=7,7-0,8$
$\large x=6,9$
$\large 5(x-2)+3=4(x+6)-25$
$\large5x-10+3=4x+24-25$
$\large5x-4x=24-25+10-3$
$\large x=6$
$\large 10x-(3x-2)-7(4+5x)+12=0$
$\large 10x-3x+2-28-35x+12=0$
$\large 10x-3x+2-28-35x+12=0$
$\large -28x=14$
$\large x=-\frac{1}{2}$
$\large 2\frac{1}{3}=\frac{5x}{12}-\frac{3x}{8}$
$\large \frac{7}{3}=\frac{5x}{12}-\frac{3x}{8}\;\;/\times 24$
$\large 56=10x-9x$
$\large x=56$
$\large \frac{3-7x}{10}-\frac{7-3x}{5}=5-\frac{x+1}{3}-6$
$\large \frac{3-7x}{10}-\frac{7-3x}{5}=5-\frac{x+1}{3}-6\;\;/\times 30$
$\large3(3-7x)-6(7-3x)=150-10(x+1)-180$
$\large 9-21x-42+18x=150-10x-10-180$
$\large-33-3x=-10x-40$
$\large7x=-7$
$\large x=-1$