if x+y = 7 and 5x - 12y = 7 then find the value of x?
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Step-by-step explanation:
x+y =7
y = 7 - x eqn (1)
substitute eqn (1) in 5x - 12y = 7
5x - 12(7 - x) = 7
5x - 84 - 12x = 7
- 7x = 7 + 84
- 7x = 91
x = 91 / 7
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