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In a triangle ABC, angle B is 5 times angle A and angle C is 18° less than 4 times angle A. Find the size of the angles.

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    A triangle has 180º.

    B = 5A
    C = 4A - 18º

    A + B + C = 180º

    Substitute values of B and C in terms of A in the last equation to solve for A. Use that value to get B and C in the other two equations. Check by inserting the three values found into the last equation.

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