1. 30+(-23)+(-15)+|-7|
2.50-(-3)+(14)+(-7)
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In 1698 Thomas Savery patented a pump with hand-operated valves to raise water from mines by suction produced by condensing steam. In about 1712 another Englishman, Thomas Newcomen, developed a more efficient steam engine with a piston separating the condensing steam from the water.
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2
Answer:
1. 30+(-23)+(-15)+|-7|
2.50-(-3)+(14)+(-7)
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