Hi @Efrat_Schwartz ,
It seems that you need to use JSL to change the format of the numbers in the equation.
Here is a sample code. I hope it helps.
Names Default To Here( 1 );
decimal_point = 2; // Please change here
rpt = current report();
frame_box_list =  rpt << xpath( "//FrameBox" );
For( i = 1, i <= N Items( frame_box_list ), i++,
	Try(
		txt_seg = rpt[Framebox( i )] << Find Seg( "TextSeg" );
		TheFormula = txt_seg << Get Text;
		current_intercept = Word( 3, TheFormula, " " );
		Intercept = Format( Num( current_intercept ), "Fixed Dec", decimal_point );
		current_beta1 = Word( 5, TheFormula, " *" );
		Beta1 = Format( Num( current_beta1 ), "Fixed Dec", decimal_point );
		new_formula = Substitute( Eval Expr( TheFormula ),
			Eval Expr( current_intercept ), Eval Expr( Intercept ),
			Eval Expr( current_beta1 ), Eval Expr( beta1 )
		);
		txt_seg << Set Text( new_formula );
	)
);
rpt << reshow;