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Subjects>Math>Math & Arithmetic

What is a-7 equals 3b plus 2?

Anonymous

∙ 14y ago

Updated: 9/19/2023

It is a linear equation in two unknown variables, a and b. It can be simplified (slightly) but cannot be solved becasue to solve with two unknowns you need two independent equations.

Incidentally,

a + 5 = (a - 7) + 12 = (3b + 2) +12 = 3b +14

Wiki User

∙ 14y ago

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Write down both equations (I'll label them (1) and (2)):(1) a = 3b - 4(2) a + b = 16Pass b to the left side of the equation (1):(1) a - 3b = -4(2) a + b = 16Multiply (1) by -1:(1) -a + 3b = 4(2) a + b = 16Add down both equations:-a + 3b + a + b = 4 + 164b = 20b = 5Replace b in (2):a + 5 = 16a = 11

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