Найдите значения выражений. -21 целая 2/7(-3,5a+1,4b+1,75c)-32b-40c=69a+3 целых 1/3(1,5a+0,6b+0,75c)

[latex]-21 \frac{2}{7} (-3,5a+1,4b+1,75c)-32b-40c=69a+3 \frac{1}{3} (1,5a+0,6b+0,75c)[/latex] [latex] \frac{149}{2} a- \frac{149}{5} b- \frac{149}{4} c-32b-40c=69a+5a+2b+ \frac{25}{10} c[/latex] [latex]74,5a-29,8b-37,25c-32b-40c=69a+5a+2b+2,5c[/latex] [latex]74,5a-61,8b-77,25c=74a+2b+2,5c[/latex] [latex]74,5a-74a-61,8b-2b-77,25c-2,5c=0[/latex] [latex]0,5a-63,8b-79,75c=0[/latex]