Decide whether the values given against each other are the solutions of that equation or not :
(1) 7x = 20 - x, x = - 5/2, 5/2, 3/2
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7x+2(x+2)=20-(2x-5)7x+2x+4=20-2x+57x+2x+2x=20+5-411x=21x=21/11
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