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2x + 5 = 5x - 7
2x - 5x = -7 -5
-3x = -12
x = -12/-3
x = 4
QR = 5X - 7
QR = 5(4) - 7
QR= 20-7
QR= 13
2x + 5 = 5x - 7
2x - 5x = -7 - 5
-3x = -12
x = -12/-3
x = 4
QR = 5x - 7
QR = 5(4) - 7
QR = 20 - 7
QR = 13 cm
semoga membantu ya :)