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Question

Find the value x:
x+12+x+23=2x57+9

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Solution

x+12+x+23=2x57+9

3(x+1)+2(x+2)6=2x5+9×77

(3x+3+2x+4)×7=6×(2x5+63)

(5x+7)×7=6×(2x+58)

35x+49=12x+348

23x=299

x=13

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