$$7-487+471+573=; 16-0+20+99=; 22-\theta+4+120=; 51-453+435+526=; 55-453+357+526=; 20-546+424+647=; 2-453+424+622=; 77-453+496+439=$$
$a=564$
$$16+20+99=22-\theta +4+120$$
$$36+99=22-\theta +4+120$$
$$135=22-\theta +4+120$$
$$135=26-\theta +120$$
$$135=146-\theta $$
$$146-\theta =135$$
$$-\theta =135-146$$
$$-\theta =-11$$
$$\theta =\frac{-11}{-1}$$
$$\theta =11$$
$$a=-480+471+573$$
$$a=-9+573$$
$$a=564$$
$$\theta =11$$ $$a=564$$
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