Решите пожалуйста 1, 2 и 4 номер

#1
-2*(8a+7b)+4*(a-2b)
-16a-14b+4a-8b
-12a-22b

#2
5*(2x-3)-2*(3-2x)=15-6*(x+1)
10x-15-6+4x=15-6x-6
10x+6x+4x=15+6+15-6
20x=32
x=:30:20
x=1,5

#4
$1\frac{7}{12}+5\frac{6}{7}:(2\frac{2}{5}-3\frac{4}{7})$
$1\frac{7}{12}+5\frac{6}{7}:(\frac{12}{5}-\frac{25}{7})$
$1\frac{7}{12}+5\frac{6}{7}:(\frac{84}{35}-\frac{125}{35})$
$1\frac{7}{12}+\frac{41}{7}:(-\frac{41}{35})$
$1\frac{7}{12}+\frac{41}{7}*(-\frac{35}{41})$
$1\frac{7}{12}-5=\frac{7}{12}-4=\frac{7}{12}-\frac{4*12}{12}=\frac{7}{12}-\frac{48}{12}=-\frac{41}{12}=-3\frac{5}{12}$