Răspuns :
a=13x+7
b=x
diferența:(13x+7)-x=12x+7
12x+7=43
12x=43-7
12x=36
x=36:12
x=3
a=13×3+7=39+7=46
b=3
b=x
diferența:(13x+7)-x=12x+7
12x+7=43
12x=43-7
12x=36
x=36:12
x=3
a=13×3+7=39+7=46
b=3