exam Maths Puzzle Numerical Ability

please help me solve this problem i really need help.
6(t+7)-20=6t

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exam Other Question

my teacher has explained it over and over but i dont understand get the concept of slope intercept ISBN (very important): 0-07-822880-8
Textbook title (optional): Glencoe Geometry Integration,Applications,Connections
Edition number: PG.226
Chapter number: Chapt.4 Identifying