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A technician is solving for two unknown acute angles, 'a' and 'b', using the substitution method. If the first equation is 'a = 3b + 10' and the second equation is 'a + b = 90', the correct first step of the substitution method is to replace the variable 'a' in the second equation with the expression '3b + 10'.

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Updated 2026-04-16

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