Question

Calculati numarul x stiind ca a-b=6 si :
a)x+3·a-3 ·b=20
b) x·a-x·b+9a-9b=654

Answer 1

a) x + 3(a - b) = 20
x + 3 * 6 = 20
x = 20 - 18
x = 2
b) x(a - b) + 9 (a - b) = 654
(a - b)(x + 9) = 654
6(x + 9) = 654
6x + 54 = 654
6x = 654 - 54
x = 600 : 6
x = 100