Question

Aflati numarul x, string ca a-b=6 si x•a-x•b+9•a-9•b=654

Answer 1

$a - b = 6$

$xa - xb + 9a - 9b = 654$

$x(a - b) + 9(a - b) = 654$

$x\times 6 + 9 \times 6 = 654$

$6(x + 9) = 654 \: | \div 6$

$x + 9 = 109$

$x = 109 - 9$

$x = 100$

Answer 2

xa-xb +9a-9b =654

x(a-b ) + 9(a-b ) =654

x*6  +  9*6 = 654

6x =654- 54

6x =600

x =100