Answer:
20.1
Explanation:
Isolate the variable, x. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS.
First, distribute 7 to all terms within the parenthesis:
7(3 - x) = (7 * 3) + (7 * -x) = 21 + -7x = 21 - 7x
3x + 2 = 21 - 7x
Isolate the variable, x. Subtract 2 and add 7x to both sides:
3x (+7x) + 2 (-2) = 21 (-2) - 7x (+7x)
3x + 7x = 21 - 2
10x = 19
Divide 10 from both sides:
(10x)/10 = (19)/10
x = 19/10 = 1.9
Plug in 1.9 for x in the expression given:
26 - x - 4 = 26 - 1.9 - 4
26 - 1.9 = 24.1
24.1 - 4 = 20.1
20.1 is your value.
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