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1.2x%2.5=0.8x+7.5,x=?

7.5x2.3+1.9x2.5+12.5x0.4 =2.5x3x2.3+1.9x2.5+2.5x5x0.4 =2.5x(6.9+1.9+2) =2.5x10.8 =2.5x(10+0.8) =2.5x10+2.5x0.8 =25+2 =27

7.5X2.3+1.9X2.5+12.5X0.4 =2.5*3*2.3+1.9*2.5+2.5*5*0.4 =2.5*(3*2.3+1.9+5*0.4) =2.5*(6.9+1.9+2) =2.5*10.8 =2.5*10+2.5*0.8 =25+2 =27

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