Question

300-{123×4-[(x:3-271)-3×12]+125×12}=1243
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Answer 1

300-{123×4-[(x:3-271)-3×12]+125×12}=1243
300-{492-[(x:3-271)-36]+1500}=1243
{492-[(x:3-271)-36]+1500}=300-1243
492-[(x:3-271)-36]+1500=-943
[(x:3-271)-36]+1500=492+943
[(x:3-271)-36]+1500=1435
[(x:3-271)-36]=1435-1500
(x:3-271)-36=-65
(x:3-271)=-65+36
x:3-271=-29
x:3=271-29
x:3=242
x=242x3
x=726