Question

daca a+b=6, determinati x din 4*a+3*x+4*b=66

Answer 1

4a+4b+3x=66
4(a+b)+3x=66
4x6+3x=66
24+3x=66
3x=66-24
3x=42
x=42:3
x=14

Answer 2

4·a + 3·x + 4·b=66
stim ca a+b=6
dupa ce dam factor comun pe 4 in prima ecuatie ⇒
     4(a+b) +3·x = 66
⇒4·6 +3·x=66 ⇒ 3x=66-24
⇒3x=42
⇒x=14