5(х+6)=х+4(х+7,5)
5х+30=х+4х+30
5х-х-4х=30-30
х=0
Может так?
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5(х+6)=х+4(х+7,5)
5х+30=х+4х+30
5х-х-4х=30-30
х=0
Может так?