-4x - 21 = -1
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m/3 + 12 = 18
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-2(6z - 5) = 58
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4a - 7 + 3a + 2 = 30
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-4x = -1+21
-4x = 20
x= 20/-4
x = -5
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m/3 +12 =18
multiply by 3 on both sides
m+36 = 54
m = 54-36
m = 18
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-2(6z-5) = 58
-12z + 10 = 58
10- 58 = 12z
-48 = 12z
-48/12 = z
-4 = z
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4a -7+3a+2 =30
7a -5 =30
7a = 30 +5
7a = 35
a =35/7
a = 5
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