Al P. answered • 06/19/18

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3rd line reads:

(167.50-38.86955)[1-(1+k)/1.092] = 6.44001(1+k)/1.092

128.63045[1 - (1+k)/1.092 ] = 6.44001(1+k)/1.092

Distribute the 128.63045 on the left hand side:

128.63045 - (128.63045)(1+k)/1.092 = 6.44001(1+k)/1.092

Then they treated "(1+k)/1.092" as a unit. You have -128.63045 of them on the left and 6.44001 of them on the right. When you add 128.63045 of them to both sides you get:

128.63045 = 135.07046(1+k)/1.092

which they go on to solve for k.