a) 142.16-(7.25+4x) = (64.157) :16
142.16-(7.25+4x)=10048:16
142.16-(7.25+4x)=628
2272-(175+4x)=628
175+4x=2272-628
175+4x=1644
4x=1644-175
4x=1469
x=1469:4
x=367,25
b, [(7x+23):36-25]:29=324
(7x+23):36-25=324.29
(7x+23):36-25=9396
(7x+23):36=9396+25
(7x+23):36=9421
7x+23=9421.36
7x+23=339156
7x=339156-23
7x=339133
x=339133:7
x=48447,57143