exam Maths Puzzle Numerical Ability

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6 -(3x 1)=19 how can I solve this and check my answer

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exam Other Question

A regular polygon has 12 sides. Find the measure of each exterior angle. Show how it is done. Solve each of the system by using either addition or substitution. If a unique solution does not exist, state whether the system is dependent or inconsistent.
10x + 2y = 7
y = -5x + 3

Any help is appreciated. Thanks