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(a+112-30):2×6-300=6

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Smilehappy
(a+112-30):2x6=6+300
(a+112-30):2x6=306
(a+112-30):2=306:6
(a+112-30):2=51
a+112-30=51x2
a+112-30=102
a+112=102+30
a+112=132
a=132-112
a=20
(a+112-30):2•6-300=6/+300
(a+112-30):2•6=306/:6
(a+112-30):2=51/•2
a+112-30=102/+30
a+112=132/-112
a=20

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