Помогите решить.
найдите корень уравнения
1) 5(2х+3)+3(1-4 х)=30
2) 5(0,7-2х)+3(0,2х+6)=-4х-0,1
3)(2х+7)/3+(5х-8)/6+(1-4х)/9=(5х-2)/12
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