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a-5b=7, atunci aflati x din relatiile:
a) x+3a-15b=29 b) x-123+5a-25b=137
c) x-2a+10b+17=4 d) 47-x+7a-35b=2a-10b+4


Răspuns :

a) x + 3(a - 5b) = 29
x + 3×7 = 29
x = 29 - 21 = 8

b) x-123+ 5(a- 5b) =137
x = 137 + 123 - 5 × 7 = 14 - 35 = - 21

c) x-2(a- 5b)+17=4
x = 4 - 17 + 2 × 7 = -13 + 14 = 1

d) 47-x+7(a- 5b)=2(a-5b) + 4
x = 47 + 7×5 - 2×7 - 4
x = 43 + 35 - 14 = 64