book Maths Puzzle Numerical Ability

Find three consecutive intergers such that twice the smallest is 12 more than the largest.

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book Other Question

1. -3 = 7 - 4y

2. 2x + 4(3x - 6) = 4 - (6x + 2)

HELP, HELP
Solve the system by addition.

-3x + 5y = 8
x + 2y = 1