plssss answer thiss....plsssss guysss
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a) 2x.5 + 15 = 7x + 45
10x - 7x = 30
3x = 30
x = 10
b) 18y + 21 = 4y
18y - 4y = 21
14y = 21
y = 21/14 = 3/2
y = 1.5
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