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57 = 4x - 1 + 2x - 7 + 5
57 = 6x -8 + 5
57 = 6x - 3
57 + 3 = 6x -3 + 3
60 = 6x
60 : 6 = x
10 = x
kesimpulan
a) nilai x =10, cara di atas yaaa
b) sisi a = 4x - 1
sisi a = 4(10) - 1
sisi a = 40 - 1 = 39 cm
sisi b = 2x - 7
sisi b = 2(10)-7 = 20 - 7 = 13 cm
sisi c = 5 cm, ada di soal
57 = (4x -1) +(2x -7) +5
57 = 4x -1 +2x -7 +5
57 = 4x +2x -1 -7 +5
57 = 6x -3
57 +3 = 6x
60 = 6x
x = 60/6
x = 10
Maka, nilai x adalah 10.
Sisi a = (4x -1)
= 4(10) -1
= 40 -1
= 39
Sisi b = 2x -7
= 2(10) -7
= 20 -7
= 13
Sisi c = 5
Itu jawabannya.