MATLAB: Preventing matlab from reversing the signs in symbolic expressions

symbolic toolbox

The symbolic toolbox reverses the signs of the expressions I type. For example
syms a b
f = (1-x)*a + b
returns
b - a*(x-1)
Is there some option I can set somewhere to prevent this sign reversal, and have the above return
b + a*(1-x)
I know it's a small thing, but when x is always less than 1, it's annoying.
Thanks!

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