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------------------- x30
12x + 90 = 180
12x = 180-90
12x = 90
x = 90:12 = 7 ½
b.) 4 - ⅔x = ⅓x + 5
--------------------------- x9
36 - 6x = 3x + 45
-6x-3x = 45-36
-9x = 9
x. = 9 : -9 = -1