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143+y=659-426. x-460=880-470

Răspuns :

143+y=659-426. => 143+y =233 => y=233-143 =90
x-460=880-470  => x-460= 410 => x= 460+410 =870
143+y=233
y=233-143
y=90

x-460=410
x=410+460
x=870