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Finding Variable Value by Balancing Equations - One atta Time

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Find the value of 'a' and 'b'. Angle XQR is 180°.
Q X R L M 1a + 115 119 - 1a 1b + 61 71 - 4b
a = 7 8 9 4 5 6 1 2 3 0 . c + ( ) - × : ± x/y x x ÷ ^ b = 7 8 9 4 5 6 1 2 3 0 . c + ( ) - × : ± x/y x x ÷ ^
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