Решите уравнение а)(21+x)-34=11 б) 4x-(12-25+3x)=87 в)5x-(7+8+4x)=56 РЕШИТЕЕЕЕЕЕЕЕЕЕ...

Решите задачу:

$a)(21+x)-34=11 \\\\ 21 + x - 34 = 11\\\\ x=11-21+34\\\\ x =24 \\ \\------\\ 21+24-34 \\------\\ \\ \boxed{\boldsymbol{OTBET:x=24}}$

$b) 4x-(12-25+3x)=87 \\ \\ 4x-12+25-3x = 87\\ \\ 4x-3x=87+12-25 \\ \\ 1x = 74 \\ \\ x = 74 \\\\-----\\296-(12-25+222) = 296-209 = 87\\-----\\\\\boxed{\boldsymbol{OTBET:x=87}}$

$B)5x-(7+8+4x)=56 \\ \\ 5x-7-8-4x=56\\\\ 5x-4x=56+7+8\\\\1x=71\\\\x=71\\\\--- -\\355-7-8+284 = 340-284 = 56\\ ----\\ \\ \boxed{\boldsymbol{OTBET:x=71}}$