Simplify 45 - 138 - {60-3 - (9 - 7+3)}]
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=45-138-{60-3-(9-7+3)}
=45-138-{60-3-(2+3)}
=45-138-{60-3-5}
=45-138-{60-8}
=45-138-52
=45-190
={-145}
By BODMAS
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