Respuesta :

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(235+1)-(90+(1*3)) = 143
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Answer:

143

Explanation:

Thinking process:

The equation is balanced by balancing the charges. This gives:

235 + 1 = 90 + A + 3(1)

236 =    90 + A + 3

236  = 93 + A

     A = 236 - 93

         = 143

therefore, the value of A is 143

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