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52x5+b=124x3+25x4
20+3x12+c=148
D-2×(480×2-90:10)+5=75


Răspuns :

52x5+b=124x3+25x4
260+b=372+100
260+b=472
b=472-260
b=212

PROBA :

260+b=472
260+212=472 (adevarat )






20+3x12+c=148
20+36+c=148
56+c=148
c=148-56
c=92

Probă :
56+c=148
56+92=148 (adevarat )







D-2×(480×2-90:10)+5=75
D-2×(960 -9)+5=75
D-2×951+5=75
D-1902+5=75
D-1907=75
D=1907+75
D=1982


Proba :
D-1907=75
1982-1907=75 (adevarat )