Question

{3(2a-5)+4(7-3b)=7 2(4+b)-7(1+8a)=-53 Решите систему уравнений

Answer 1

$left { {{3(2a-5)+4(7-3b)=7} atop {2(4+b)-7(1+8a)=-53}} right. left { {{6a-15+28-12b=7} atop {8+2b-7-56a=-53}} right. left { {{6a-12b=-6}|:6 atop {2b-56a=-54}|:2} right. left { {{a-2b=-1} atop {b-28a=-27}} right. left { {{a=2b-1} atop {b-28a=-27}} right. b-28(2b-1)=-27 b-56b+28=-27 -55b=-27-28 -55b=-55 b=1 a=2*1-1 a=1$
Ответ:(1;1)