3x + 11 + 5x = 75
Collect 'like terms on the LHS
8x + 11 = 75
Subtract '11' from both sides
8x = 64
Divide both sides by '8'
8x/8 = 64/8
x = 8
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5x+3 = 3x+11 5x-3x = 11-3 2x = 8 x = 4
5x + 5 = 8 -3x 5x = 3 -3x 8x = 3 x = 0.375
9x + 3x - 9x = 6 + 8x - 113x = 8x - 11-5x = -11x = 2.2 or 11/5
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3x+7=5x-13 ----> 3x-5x=-13-7 ----> -2x=-6 -----> x=3