Answer:
-71
Step-by-step explanation:
let 'n' = a number
2(143 + 2n) = 0n + 2
2(143 + 2n) = 2
143 + 2n = 1
2n = -142
n = -71
x + 3y = 21
Equation of the line: y =mx+ b
Multiply the equation by 3
3y = -x + 21
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Answer: 10
Step-by-step explanation: you have to simplify for it to equal 10